How popular is the baby name Theo in the United States right now? How popular was it historically? Find out using the graph below! Plus, check out all the blog posts that mention the name Theo.

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Popularity of the Baby Name Theo


Posts that Mention the Name Theo

Popular baby names in Belgium, 2021

Belgium

According to data from Statistics Belgium, the country’s most popular baby names last year were Olivia and Noah.

Here are Belgium’s top 50 girl names and top 50 boy names of 2021:

Girl Names

  1. Olivia, 580 baby girls
  2. Emma, 500
  3. Louise, 455
  4. Mila, 435
  5. Alice, 416
  6. Camille, 403
  7. Lina, 394
  8. Sofia, 359
  9. Ella, 352
  10. Juliette, 346
  11. Nora, 342
  12. Mia, 325
  13. Marie, 317
  14. Lucie, 314
  15. Anna, 303
  16. Jade, 296
  17. Elena, 281
  18. Eva, 280
  19. Julia, 279
  20. Noor, 263
  21. Nina, 256
  22. Léa, 252
  23. Victoria, 249
  24. Chloé, 244
  25. Alix, 235
  26. Lou, 232
  27. Elise, 220
  28. Zoé, 215
  29. Giulia, 212
  30. Ellie, 210 (tie)
  31. Luna, 210 (tie)
  32. Liv, 209
  33. Renée, 207
  34. Amélie, 204
  35. Inaya, 202
  36. Rose, 194
  37. Charlotte, 191
  38. Jeanne, 188 (tie)
  39. Lily, 188 (tie)
  40. Lena, 187
  41. Sara, 176
  42. Manon, 171
  43. Julie, 170
  44. Mona, 160
  45. Alba, 159
  46. Livia, 155
  47. Billie, 154 (tie)
  48. Sophia, 154 (tie)
  49. Amira, 146
  50. Clara, 144 (tie)
  51. Stella, 144 (tie)

Boy Names

  1. Noah, 627 baby boys
  2. Arthur, 584
  3. Louis, 558
  4. Liam, 537
  5. Jules, 526
  6. Adam, 474
  7. Lucas, 426
  8. Gabriel, 422
  9. Victor, 416
  10. Oscar, 336
  11. Leon, 310
  12. Mathis, 294 (tie)
  13. Mohamed, 294 (tie)
  14. Finn, 289
  15. Léon, 275
  16. Matteo, 264
  17. Lewis, 251
  18. Hugo, 245
  19. Nathan, 238
  20. Luca, 234
  21. Elias, 225
  22. Raphaël, 223
  23. Théo, 221
  24. Amir, 217 (tie)
  25. Eden, 217 (tie)
  26. Rayan, 209
  27. Lou, 208
  28. Milo, 205
  29. Yanis, 204
  30. Achille, 201
  31. Otis, 194
  32. Sacha, 191 (tie)
  33. Vic, 191 (tie)
  34. Felix, 190
  35. Marcel, 187
  36. Basile, 185
  37. Aaron, 179
  38. Léo, 178
  39. Maurice, 174
  40. Alexander, 173
  41. Maël, 171
  42. Emiel, 168 (tie)
  43. Georges, 168 (tie)
  44. Jack, 167 (tie)
  45. William, 167 (tie)
  46. Emile, 163 (tie)
  47. Vince, 163 (tie)
  48. Samuel, 161
  49. Gaston, 159
  50. Oliver, 158

If Leon and Léon had been counted as a single name, their combined total (585) would have been enough to edge Arthur (584) out of second place on the boys’ list.

And the gender-neutral name Lou managed to pop up on both lists in nearly the same spot: 26th for girls, 27th for boys.

Map of the three regions of Belgium
Belgium’s three regions

The top baby names within each of Belgium’s three regions were…

Girl NamesBoy Names
Flanders
(57.6% of the population)
Language: Dutch
1. Olivia, 328
2. Ella, 303
3. Marie, 275
4. Mila, 266
5. Nora, 261
1. Noah, 399
2. Arthur, 321
3. Jules, 311
4. Leon, 288
5. Louis, 284
Wallonia
(31.8% of pop.)
Language: French/German
1. Emma, 204
2. Olivia, 203
3. Louise, 190
4. Alice, 188 (tie)
5. Lucie, 188 (tie)
1. Gabriel, 266
2. Louis, 235
3. Liam, 233
4. Arthur, 208
5. Jules, 191
Brussels-Capital
(10.6% of pop.)
Languages: Dutch/French
1. Lina, 89
2. Sofia, 83
3. Emma, 60 (tie)
4. Nour, 60 (tie)
5. Olivia, 49
1. Mohamed, 118
2. Adam, 112
3. Gabriel, 82
4. Amir, 70
5. Noah, 62

And here’s a selection of names from the other end of the spectrum — names that were given to just 5 babies each in Belgium last year:

Rare Girl NamesRare Boy Names
Anabia, Believe, Caro, Dea, Elaïa, Fallone, Gaby, Heike, Iluna, Jennifer, Kessy, Lyssia, Mahsa, Nihal, Otice, Puck, Queen, Ramla, Siloé, Toos, Vlera, Wassila, Yseult, ZuriAloys, Brandon, Celle, Doruk, Erion, Fedde, Gustav, Hazar, Ilyass, Jip, Karsten, Lothar, Maksim, Nellis, Obi, Paulin, Qays, Riff, Silvio, Tille, Vidar, Wiebe, Yavuz, Zjef

(I’m a little surprised that as many as 5 baby girls in Belgium got the English word “believe” as their first name. I wonder if something specific was influencing that usage…?)

This time around, Belgium also highlighted the girl and boy names that saw the largest increases and decreases in usage over the last decade (2011-2021). The top 5 in each category were…

  • Girl names
    • Largest increases: Alba, Ellie, Ellis, Alya, Cilou
    • Largest decreases: Lisa, Laura, Julie, Lotte, Anaïs
  • Boy names
    • Largest increases: Georges, Lio, Gaston, Otis, Lyam
    • Largest decreases: Maxime, Thomas, Simon, Wout, Nathan

Finally, here’s a link to Belgium’s 2020 rankings, if you’d like to compare.

Sources: First names for boys and girls | STATBEL, Demographics of Belgium – Wikipedia

Map: Adapted from Regions of Belgium by Ssolbergj under CC BY 3.0.

Popular and unique baby names in Zurich, 2021

zurich

According to the government of Zurich, the most popular baby names last year in the German-speaking Swiss city were Olivia and Noah.

Here are Zurich’s top girl names and top boy names of 2021:

Girl Names

  1. Olivia, 28 baby girls
  2. Emma, 25
  3. Anna, 24 (tie)
  4. Ella, 24 (tie)
  5. Mia, 22 (3-way tie)
  6. Sofia, 22 (3-way tie)
  7. Sophia, 22 (3-way tie)
  8. Elena, 20
  9. Charlotte, 19
  10. Lina, 18
  11. Sophie, 17
  12. Yara, 16
  13. Nora, 15
  14. Clara, 14 (3-way tie)
  15. Lea, 14 (3-way tie)
  16. Zoe, 14 (3-way tie)

Boy Names

  1. Noah, 27 baby boys
  2. Leo, 24
  3. Louis, 22
  4. Theo, 20
  5. Levi, 18 (3-way tie)
  6. Luca, 18 (3-way tie)
  7. Mateo, 18 (3-way tie)
  8. Luis, 17 (tie)
  9. Maximilian, 17 (tie)
  10. Felix, 16 (4-way tie)
  11. Finn, 16 (4-way tie)
  12. Leonardo, 16 (4-way tie)
  13. Liam, 16 (4-way tie)
  14. Daniel, 15 (4-way tie)
  15. Elias, 15 (4-way tie)
  16. Jan, 15 (4-way tie)
  17. Vincent, 15 (4-way tie)

Though I’ve posted rankings for Switzerland before, I’ve never looked at the rankings for Zurich specifically, so I don’t have any past sets of rankings to compare this set to.

But — because Zurich’s rankings included everything from the top names down to the single-use names — I can give you a sampling of the baby names that were bestowed just once last year in Switzerland’s largest city:

Unique Girl NamesUnique Boy Names
Aola, Belangie, Cybèle, Diola, Elfida, Flurina, Gresa, Heja, Illiyeen, Jenaja, Kumru, Leviah, Milaine, Nissy, Odine, Proxima, Quimey, Reisel, Shiffra, Tabia, Ursina, Vennila, Wilma, Yelira, ZoélieAstérion, Bodo, Corvin, Doruk, Ezriel, Falko, Giordano, Henning, Ilyas, Jaromir, Koshin, Leart, Mazlum, Nahuel, Orfeo, Pavle, Qiheng, Rikuto, Solan, Tanju, Umor, Viggo, Wybe, Yonah, Zaam

Sources: Vornamen-Verzeichnis 2021 – Stadt Zürich, The most popular baby names in Zurich in 2021, Zurich – Wikipedia

Popular baby names in Northern Ireland, 2021

Northern Ireland

According to the Northern Ireland Statistics and Research Agency (NISRA), the most popular baby names in Northern Ireland last year were Grace and Jack.

Here are the Northern Ireland’s top 10 girl names and top 10 boy names of 2021:

Girl Names

  1. Grace, 182 baby girls
  2. Emily, 150
  3. Fiadh, 149
  4. Olivia, 148
  5. Isla, 138
  6. Sophie, 128
  7. Aoife, 122
  8. Ella, 111
  9. Anna, 106
  10. Sophia, 102

Boy Names

  1. Jack, 193 baby boys
  2. Noah, 191
  3. James, 173
  4. Charlie, 155
  5. Oliver, 131
  6. Theo, 119
  7. Leo, 117
  8. Cillian, 116
  9. Finn, 115
  10. Harry, 114

In the girls’ top 10, Aoife and Anna replaced Amelia, Lucy and Freya. (Two replaced three because there was a tie for tenth last year.)

In the boys’ top 10, Leo replaced Thomas.

And on the other side of the spectrum…

Northern Ireland’s downloadable data only goes down to names given to 3 babies, technically, but this batch of data — like the 2020 batch — included two extra alphabetized sets of names at the end. I believe these sets of names were the ones given to 2 babies and 1 baby, respectively. With that theory in mind, here’s a sampling of names from the second set:

Unique Girl NamesUnique Boy Names
Aodhla, Bediha, Caodhla, Darbie, Edera, Farbhlaidh, Gullandama, Harryanna, Izzy, Jersey, Khalessee, Lasairfhiona, Moya-Grace, Nollaig, Otter, Pupa, Qismina, Rozerin, Samhradh, Toireasa, Ugne, Venba, Wanda, Xanthe, Yarra, ZarkaAstraeus, Brogain, Chulainn, Dubhlainn, Edico, Finnian, Gerard-Og, Holiness, Iollan, Jefaldo, Kestrel, Laochrainn, Murdo, Nivonio, Orin, Padraic, Quevin, Riocht, Struan, Tuathal, Uisce, Vinny, Wai, Xayah, Yeats, Zeyue

Explanations/associations for some of the above…

  • Farbhlaidh – Irish for “overlord, ruler.”
  • Lasairfhiona – Irish for “flame of wine” — lasair meaning “flame,” fhíona meaning “of wine.” (The Irish word for “wine” is fíon.)
  • Nollaig – Irish for “Christmas.”
  • Samhradh – Irish for “summer.”
  • Chulainn – a reference to Cú Chulainn of Irish mythology.
  • Riocht – Irish for “kingdom.”
  • Tuathal – both a legendary conqueror of Ireland (Túathal Techtmar) and the Irish word for “counterclockwise.”
  • Uisce – Irish for “water.” (Also the word upon which “whiskey” was based!)
  • Yeats – a reference to W. B. Yeats, the Irish poet.

Finally, here are the 2020 rankings for Northern Ireland, if you’d like to compare.

Sources: Baby Names – NISRA, Irish Names and Surnames, Wiktionary

Popular baby names in Brazil, 2021

brazil

According to Brazil’s Transparência do Registro Civil (part of Arpen-Brasil), the most popular baby names in the country in 2021 were Helena and Miguel.

Here are the Brazil’s top 10 girl names and top 10 boy names of 2021:

Girl Names

  1. Helena, 21,890 baby girls
  2. Alice, 20,381
  3. Laura, 18,448
  4. Maria Alice, 14,677
  5. Valentina, 11,643
  6. Heloísa, 11,355
  7. Maria Clara, 10,980
  8. Maria Cecília, 10,850
  9. Maria Julia, 10,235
  10. Sophia, 10,163

Boy Names

  1. Miguel, 28,301 baby boys
  2. Arthur, 26,655
  3. Gael, 23,973
  4. Heitor, 22,368
  5. Theo, 19,853
  6. Davi, 18,304
  7. Gabriel, 17,159
  8. Bernardo, 15,935
  9. Samuel, 15,563
  10. João Miguel, 13,254

The swift rise of Gael is notable. In 2019, Gael wasn’t even in the boys’ top 50. But the name shot up to 10th place in 2020, then jumped to 3rd in 2021. (Anyone out there have any theories about the sudden trendiness of Gael in Brazil?)

In 2020, the top two names were also Helena and Miguel. In 2019, they were Enzo Gabriel and Maria Eduarda.

Sources: Miguel e Helena são os nomes mais registrados no Brasil em 2021; veja lista, Enzo? Valentina? Veja nomes mais comuns registrados em 2021

Top first letters of baby names in the U.S., 2021

Which first letters were the most and least popular for U.S. baby names in 2021?

Top first letters for girl names: A, E, M

For baby girls, the most-used first letter was A, followed by E and M. The least-used first letter was U.

Graph of first letter popularity for U.S. baby girl names, 2021

The most popular girl names per letter were…

  • A-names (over 273,100 baby girls): Amelia, Ava, Abigail, Avery, Aria, Aurora
  • B-names (over 49,300): Brooklyn, Bella, Brielle, Blakely, Bailey, Brianna
  • C-names (over 93,100): Charlotte, Camila, Chloe, Claire, Caroline, Cora
  • D-names (over 40,300): Delilah, Daisy, Diana, Daniela, Delaney, Dakota
  • E-names (over 155,300): Emma, Evelyn, Elizabeth, Eleanor, Ella, Emily
  • F-names (over 16,500): Freya, Faith, Finley, Fiona, Fatima, Frances
  • G-names (over 42,900): Gianna, Grace, Genesis, Gabriella, Genevieve, Georgia
  • H-names (over 54,900): Harper, Hazel, Hannah, Hailey, Hadley, Harmony
  • I-names (over 44,100): Isabella, Isla, Ivy, Iris, Isabelle, Isabel
  • J-names (over 73,500): Josephine, Jade, Julia, Josie, Juniper, Jasmine
  • K-names (over 89,100): Kinsley, Kennedy, Kaylee, Kehlani, Katherine, Kylie
  • L-names (over 115,300): Luna, Layla, Lily, Leah, Lucy, Lillian
  • M-names (over 143,500): Mia, Mila, Madison, Maya, Madelyn, Madeline
  • N-names (over 58,800): Nora, Nova, Naomi, Natalie, Natalia, Nevaeh
  • O-names (over 30,200): Olivia, Olive, Oakley, Oaklynn, Octavia, Ophelia
  • P-names (over 37,600): Penelope, Paisley, Piper, Peyton, Parker, Presley
  • Q-names (over 4,100): Quinn, Quincy, Queen, Quinley, Quetzalli, Quinnley
  • R-names (over 74,800): Riley, Ruby, Rylee, Raelynn, Rose, Remi
  • S-names (over 116,400): Sophia, Sofia, Scarlett, Stella, Savannah, Skylar
  • T-names (over 24,200): Taylor, Teagan, Trinity, Tatum, Tessa, Talia
  • U-names (over 600): Unique, Uma, Ulani, Una, Unknown, Unity
  • V-names (over 32,400): Violet, Victoria, Valentina, Vivian, Valerie, Valeria
  • W-names (over 14,700): Willow, Wren, Winter, Wynter, Willa, Wrenley
  • X-names (over 4,500): Ximena, Xiomara, Xyla, Xena, Xochitl, Xitlali
  • Y-names (over 7,600): Yaretzi, Yara, Yareli, Yasmin, Yamileth, Yuna
  • Z-names (over 29,100): Zoey, Zoe, Zuri, Zara, Zariah, Zelda

Top first letters for boy names: J, A, L

For baby boys, the most-used first letter was J, followed by A and L. The least-used first letter was U.

Graph of first letter popularity for U.S. baby boy names, 2021

The most popular boy names per letter were…

  • A-names (over 178,600 baby boys): Alexander, Asher, Aiden, Anthony, Andrew, Adrian
  • B-names (over 86,600): Benjamin, Brooks, Bennett, Beau, Bryson, Brayden
  • C-names (over 123,000): Carter, Charles, Caleb, Christopher, Cameron, Cooper
  • D-names (over 85,000): Daniel, David, Dylan, Dominic, Declan, Damian
  • E-names (over 108,700): Elijah, Ethan, Ezra, Elias, Ezekiel, Eli
  • F-names (over 20,500): Finn, Felix, Finley, Francisco, Fernando, Finnegan
  • G-names (over 53,500): Grayson, Gabriel, Greyson, Gael, Giovanni, George
  • H-names (over 50,000): Henry, Hudson, Hunter, Harrison, Hayden, Hayes
  • I-names (over 31,500): Isaac, Isaiah, Ian, Ivan, Israel, Ismael
  • J-names (over 202,800): James, Jack, Jackson, Jacob, John, Joseph
  • K-names (over 93,400): Kai, Kayden, Kingston, Kaiden, Kevin, King
  • L-names (over 133,400): Liam, Lucas, Levi, Logan, Leo, Luke
  • M-names (over 126,700): Mateo, Michael, Mason, Matthew, Maverick, Miles
  • N-names (over 57,400): Noah, Nathan, Nolan, Nicholas, Nathaniel, Nicolas
  • O-names (over 38,800): Oliver, Owen, Oscar, Omar, Orion, Odin
  • P-names (over 23,700): Parker, Patrick, Peter, Preston, Phoenix, Paxton
  • Q-names (over 3,100): Quinn, Quentin, Quincy, Quinton, Quintin, Quinten
  • R-names (over 82,800): Ryan, Roman, Robert, Rowan, River, Ryder
  • S-names (over 70,300): Sebastian, Samuel, Santiago, Silas, Sawyer, Steven
  • T-names (over 59,200): Theodore, Thomas, Thiago, Theo, Tyler, Tucker
  • U-names (over 2,500): Uriel, Uriah, Ulises, Ulysses, Uziel, Umar
  • V-names (over 11,000): Vincent, Victor, Valentino, Vincenzo, Vicente, Vihaan
  • W-names (over 49,100): William, Wyatt, Waylon, Wesley, Weston, Walker
  • X-names (over 7,200): Xavier, Xander, Xzavier, Xavion, Xavien, Xavian
  • Y-names (over 8,200): Yusuf, Yosef, Yehuda, Yousef, Yahir, Yisroel
  • Z-names (over 26,900): Zion, Zachary, Zayden, Zane, Zayn, Zander