Meaning and name origin
Billa \b(il)-la\ as a girl's name is of Old English and Old German origin, and the meaning of Billa is "determined protector". Billa is a variant of Billie (Old English): originally a nickname for William. Also a variant of Wilhelmina (Old German): the second element of the source phrase literally refers to a helmet.
Billa is not a popular first name for females but a very popular surname or last name for all people (#30735 out of 88799, Top 35%) (2000 U.S. Census).
Billa is also pronounced similarly to Baila, Bailly, Bayla, Belia, Bella▲, Beula, Beyla, Bilee, Billee, Billey, Billi, Billy▼, Billye▼ and Byla. Other suggested similar baby names are Bell▼, Belle▼, Cilla, Dilla, Lilla▼, Milla, Rilla▼, Willa▲ and Zilla. These names tend to be more commonly used than Billa.