How popular is the baby name Theo in the United States right now? How popular was it historically? Use the popularity graph and data table below to find out! Plus, see 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 Gibraltar, 2024

Flag of Gibraltar
Flag of Gibraltar

Last year, the British overseas territory of Gibraltar welcomed 331 babies — 148 baby girls and 183 baby boys.

What were the most popular names among these babies? Olivia for girls and Noah/Thomas (tie) for boys.

Here are Gibraltar’s top girl names and top boy names of 2024:

Girl names

  1. Olivia, 5 baby girls
  2. Emilia, 4
  3. Matilda and Zara, 3 each (tie)

Boy names

  1. Noah and Thomas, 5 baby boys each (tie)
  2. Luca and Sebastian, 4 each (tie)
  3. Leon, Liam, Oliver, Ryan, Theo, and Tommy, 3 each (6-way tie)

The name Jamie was also given to three babies, but my source didn’t include much information on gender, so I don’t know if these three babies were boys, girls, or a mix of both.

The 36 names given to two babies each were Addison, Alexander, Annabelle, Arabella, Ariana, Axel, Celine, Charles, Emily, Emma, Enzo, Evan, George, Hugo, Jacob, Jesse, Julia, Kai, Kylian, Leo, Lucia, Luna, Maisie, Mia, Michael, Mila, Nicolas, Riley, Robyn, Romeo, Romy, Salma, Sofia, Stella, Thiago, and Zack.

And the 200+ names bestowed just once in Gibraltar last year were…

Adah, Adam, Adonis, Aiden, Aidon, Ajay, Alba, Albert, Aleia, Alesia, Alessandro, Alice, Alistair, Amara, Amber, Amelia, Amina, Amine, Amoura, Ana, Anas, Anaya, Andrew, Antonio, Archie, Aria, Arianna, Arley, Arlo, Arthur, Ava, Aya, Ayla, Azaria, Bella, Billy, Blake, Bodhi, Brenda, Caleb, Callie, Camden, Cara, Catharine, Cecilia, Charlie, Charlotte, Christian, Cleo, Connor, Cora, Danah, Daniella, Darcie, Darcy, Delilah, Duyna, Dylan, Edward, Eladio, Elena, Elia, Elian, Elias, Ella, Elliot, Ellis, Elowyn, Elton, Eric, Esmae, Esteban, Everleigh, Evie, Ezra, Frankie, Freya, Furkan, Gabriella, Geremiah, Gia, Gigi, Giorgia, Giorgio, Grace, Gracie, Hadley, Halo, Hannah, Haroun, Harper, Harry, Haven, Henry, Hudson, Ian, Inaaya, Inaya, Isabella, Isadora, Isla, Islam, Ivy, Jack, Jae, Jake, James, Jason, Javier, Jax, Jay, Jaylan, Joylisa, Jude, Jules, Kaine, Kallie, Katie, Kenzie, Kenzo, Khylo, Koby, Kody, Lara, Laurie, Lee, Lewis, Lilliana, Liya, Lorena, Louis, Luciano, Luke, Maeve, Manxin, Marcel, Martin, Mason, Matthew, Max, Milan, Millie, Mollie, Moshe, Mya, Myla, Naia, Naiomi, Naira, Nariah, Nellie, Niall, Nicola, Nylah, Osayd, Peter, Posie, Rachel, Rafaella, Ralfs, Ramy, Rayan, Reign, Reuven, Rian, Rina, Rio, Roan, Robbie, Robert, Roman, Rosa, Rose, Rotem, Ruairi, Ruben, Ruhe, Rupert, Sarah, Scarlett, Sean, Seth, Shashana, Shivika, Sophia, Sophie, Spencer, Sunny, Sykes, Talia, Tassim, Theodore, Tiana, Timothy, Tobias, Tristan, Tyler, Valentina, Victor, Yaakov, Zachary, Zayd, Zoe, Zyna, Zyon

Finally, here are Gibraltar’s 2023 rankings, if you’d like to compare last year to the year before.

Source: “Thomas, Noah & Olivia the most popular baby names in 2024.” GBC News 25 Mar. 2025.

Image: Adapted from Flag of Gibraltar (public domain)

Popular baby names on the Isle of Man, 2024

Flag of the Isle of Man
Flag of the Isle of Man

The Isle of Man — a 227-square-mile island located between the larger islands of Ireland and Great Britain — welcomed 574 babies last year.

What were the most popular names among these babies? Lili and Oliver.

Here are the Isle of Man’s top 5 girl names and top 4 boy names of 2024:

Girl names

  1. Lili/Lilee/Lillie/Lillee
  2. Arabella/Arabelle
  3. Delilah
  4. Florence
  5. Harper

Boy names

  1. Oliver
  2. Archie
  3. Noah
  4. Theo/Theodore

The Lily-group also ranked #1 for girls in 2022, but did not make the list at all in 2023.

Sources: Isle of Man’s most popular baby names in 2024 revealed as Lili/Lilee/Lillie/Lillee and Oliver – Isle of Man Government, Overview – Isle of Man – Isle of Man Government

Image: Adapted from Flag of the Isle of Man (public domain)

Top names for baby boys, letter by letter, in 2024

First letters of baby boy names in 2024 (U.S.)

The most common first letter for baby boy names last year was J (used 10.7% of the time), followed by A (10.5%) and L (7.5%).

The least common first letter was Q (used 0.1% of the time), followed by U (0.2%) and X (0.4%).

So, what were the most popular boy names of 2024 within each letter group?

Top boy names starting with A:

  1. Asher
  2. Alexander
  3. Anthony
  4. Aiden
  5. Angel

Top boy names starting with B:

  1. Benjamin
  2. Bennett
  3. Brooks
  4. Beau
  5. Bryson

Top boy names starting with C:

  1. Carter
  2. Caleb
  3. Cooper
  4. Charles
  5. Christopher

Top boy names starting with D:

  1. Daniel
  2. Dylan
  3. David
  4. Dominic
  5. Damian

Top boy names starting with E:

  1. Elijah
  2. Ezra
  3. Ethan
  4. Elias
  5. Ezekiel

Top boy names starting with F:

  1. Felix
  2. Finn
  3. Finley
  4. Francisco
  5. Fernando

Top boy names starting with G:

  1. Gabriel
  2. Grayson
  3. Gael
  4. Giovanni
  5. George

Top boy names starting with H:

  1. Henry
  2. Hudson
  3. Harrison
  4. Hunter
  5. Hayden

Top boy names starting with I:

  1. Isaac
  2. Isaiah
  3. Ian
  4. Ivan
  5. Ismael

Top boy names starting with J:

  1. James
  2. Jack
  3. John
  4. Julian
  5. Joseph

Top boy names starting with K:

  1. Kai
  2. Kayden
  3. Kingston
  4. Kevin
  5. Kaiden

Top boy names starting with L:

  1. Liam
  2. Lucas
  3. Levi
  4. Luca
  5. Leo

Top boy names starting with M:

  1. Mateo
  2. Michael
  3. Matthew
  4. Maverick
  5. Miles

(Mason, which ranked third in 2023, dropped to sixth last year.)

Top boy names starting with N:

  1. Noah
  2. Nathan
  3. Nolan
  4. Nicholas
  5. Nathaniel

Top boy names starting with O:

  1. Oliver
  2. Owen
  3. Oscar
  4. Omar
  5. Otto

Top boy names starting with P:

  1. Parker
  2. Peter
  3. Patrick
  4. Paul
  5. Phoenix

Top boy names starting with Q:

  1. Quinn
  2. Quincy
  3. Quentin
  4. Quinton
  5. Quintin

Top boy names starting with R:

  1. Roman
  2. Rowan
  3. Ryan
  4. Robert
  5. River

Top boy names starting with S:

  1. Sebastian
  2. Samuel
  3. Santiago
  4. Silas
  5. Sawyer

Top boy names starting with T:

  1. Theodore
  2. Thomas
  3. Thiago
  4. Theo
  5. Tyler

Top boy names starting with U:

  1. Uriel
  2. Uriah
  3. Ulises
  4. Umar
  5. Ulysses

Top boy names starting with V:

  1. Vincent
  2. Victor
  3. Valentino
  4. Vicente
  5. Vincenzo

Top boy names starting with W:

  1. William
  2. Wyatt
  3. Wesley
  4. Waylon
  5. Weston

Top boy names starting with X:

  1. Xavier
  2. Xander
  3. Xzavier
  4. Xavi
  5. Xyleek

(Xyleek debuted impressively in the data last year.)

Top boy names starting with Y:

  1. Yusuf
  2. Yosef
  3. Yahya
  4. Yehuda
  5. Yahir

Top boy names starting with Z:

  1. Zion
  2. Zachary
  3. Zayden
  4. Zayn
  5. Zyaire

Source: SSA

Popular baby names in Scotland (UK), 2024

Flag of the United Kingdom
Flag of the United Kingdom

Last year, the country of Scotland — which takes up the northern third of Great Britain — welcomed 45,779 babies.

What were the most popular names among these babies? Olivia and Noah.

Here are Scotland’s top 50 girl names and top 50 boy names of 2024:

Girl names

  1. Olivia, 266 baby girls
  2. Isla, 264
  3. Freya, 244
  4. Lily, 231
  5. Millie, 222
  6. Sophia, 214
  7. Amelia, 198 (tie)
  8. Emily, 198 (tie)
  9. Ella, 195
  10. Charlotte, 191
  11. Ava, 188 (tie)
  12. Bonnie, 188 (tie)
  13. Grace, 183
  14. Evie, 180 (tie)
  15. Ivy, 180 (tie)
  16. Rosie, 167
  17. Sophie, 164
  18. Maisie, 161
  19. Maya, 159 (tie)
  20. Orla, 159 (tie)
  21. Harper, 149
  22. Sofia, 147
  23. Aria, 142
  24. Poppy, 135
  25. Maeve, 129
  26. Mia, 126
  27. Daisy, 123
  28. Lucy, 113
  29. Willow, 106
  30. Mila, 105
  31. Elsie, 104 (tie)
  32. Hallie, 104 (tie)
  33. Esme, 102
  34. Ruby, 100
  35. Ellie, 99
  36. Zara, 98
  37. Lottie, 97
  38. Eilidh, 91 – pronounced EH-lee
  39. Ayla, 90 (tie)
  40. Chloe, 90 (tie)
  41. Layla, 89 (3-way tie)
  42. Sienna, 89 (3-way tie)
  43. Violet, 89 (3-way tie)
  44. Ada, 87
  45. Skye, 83
  46. Phoebe, 82
  47. Callie, 81
  48. Jessica, 80 (tie)
  49. Robyn, 80 (tie)
  50. Isabella, 79

Boy names

  1. Noah, 366 baby boys
  2. Muhammad, 293
  3. Rory, 275
  4. Theo, 270
  5. Leo, 260
  6. Luca, 255
  7. Jack, 247 (tie)
  8. Oliver, 247 (tie)
  9. Harris, 243
  10. Archie, 228
  11. Finlay, 220
  12. Alexander, 208 (tie)
  13. Jude, 208 (tie)
  14. James, 203
  15. Alfie, 196
  16. Brodie, 195
  17. Finn, 190
  18. Arlo, 177
  19. Charlie, 159
  20. Thomas, 154 (tie)
  21. Tommy, 154 (tie)
  22. Oscar, 151
  23. Lucas, 147
  24. Arthur, 145
  25. Freddie, 144 (tie)
  26. Mason, 144 (tie)
  27. Jacob, 141
  28. Lewis, 136
  29. Logan, 132 (tie)
  30. Max, 132 (tie)
  31. Harry, 124
  32. Albie, 123
  33. Cameron, 117
  34. Ollie, 116
  35. Myles, 111
  36. Callan, 108 (tie)
  37. Theodore, 108 (tie)
  38. Angus, 106 (tie)
  39. Reuben, 106 (tie)
  40. Harrison, 105
  41. Blake, 102
  42. Adam, 101 (tie)
  43. Caleb, 101 (tie)
  44. Sonny, 100
  45. Louie, 99
  46. Roman, 98
  47. Liam, 93
  48. George, 91
  49. Isaac, 90
  50. Luke, 89

Muhammad, which entered the boys’ top 100 in 2008, jumped from 11th to 2nd place.

And the bonny name Bonnie, which entered the girls’ top 100 in 2018, now sits just outside the top 10.

Last year’s fastest-rising girl names already in the top 100 were Violet, Arabella, Myla, and Chloe, while the fastest-rising girl names entering the top 100 for the first time were Eliza, Romy, and Nora.

The fastest-rising boy names already in the top 100 were Myles, Callan, Ruairidh, and Lochlan, while the fastest-rising boy name entering the top 100 for the first time was Reggie.

Una and Ernie, two of the top names in the Scottish archipelago of Orkney, were given to 19 baby girls and six baby boys (respectively) nation-wide.

Here’s a selection of the names that were given to just three babies each in Scotland last year:

Rare girl namesRare boy names
Aizal, Beira, Ceilidh, Davina, Este, Fleur, Greta, Hadley, Ines, Jemimah, Kassie, Lavinia, Merida, Nicola, Opal, Peach, Roxy, Safiyyah, Tully, Verity, Yuna, ZarishArgyll, Bruce, Cobi, Derek, Ernest, Frazer, Graham, Harbaaz, Innis, Justin, Korey, Lawrie, Malachi, Niven, Orran, Percy, Rui, Somhairle, Thorfinn, Uzair, Wilder, Zahir

Beira is a modern Scottish name for the Gaelic mythological figure Cailleach, and Innis is a Scottish Gaelic word meaning “small island, islet.”

(I can’t give you the usual sampling of Scotland’s single-use names because, as of 2024, the country has decided to stop releasing names given to fewer than three babies. The news release noted that “the exclusion of the names given to one or two babies is consistent with policies in England and Wales and Northern Ireland.”)

Finally, here are Scotland’s 2023 rankings, if you’d like to compare last year to the year before.

Sources:

Image: Adapted from Flag of the United Kingdom (public domain)