Any Hebrew/Yiddish name, even Sara, can become any secular name. Even if
the name is sometimes used in English, if the person liked something else or
thought that something else was more fashionable, he/she would use it. Of
course, the initial sound was often kept the same (but my grandmother
Matilda was originally Rosa, I found out).
Selma was very popular in the US early in the 20th century, so Sara was
Albany, NY soon Stamford, CT