The German name Liesl (pronounced LEE-zl), which is related to Elizabeth, first appeared in the U.S. baby name data in 1965:
- 1967: 96 baby girls named Liesl
- 1966: 100 baby girls named Liesl
- 1965: 24 baby girls named Liesl [debut]
- 1964: unlisted
- 1963: unlisted
This was the year the Oscar-winning movie musical The Sound of Music was released. Set in Austria in the late 1930s, the film told the story of singing governess Maria (played by Julie Andrews) and featured the seven children of the von Trapp family: Liesl, Friedrich, Louisa, Kurt, Brigitta, Marta, and Gretl.
Eldest child Liesl (played by Charmian Carr) was “Sixteen Going on Seventeen,” as she explains in the song:
The movie was modeled after the Tony award-winning musical of the same name, which was ultimately based upon the 1949 memoir The Story of the Trapp Family Singers by Maria Augusta von Trapp. (Maria ended up marrying the children’s widowed father, Georg, and thereby becoming a von Trapp herself.)
In real life, the seven von Trapp children were named Rupert, Agathe, Maria, Werner, Hedwig, Johanna, and Martina. Later, Georg and Maria welcomed three more: Rosmarie, Eleonore (nn “Lorli”), and Johannes.
Sources: The Sound of Music – Wikipedia, SSA