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The boy's and girl's name Billy \b(il)-ly\ is a variant of Billie (Old English) and Wilhelmina (Old German), and the meaning of Billy is "determined protector". The baby name Billy sounds like Bailly, Billye, Billi, Billa and Billey. Other similar baby names are Milly, Cilly, Gilly, Hilly, Jilly, Lilly, Tilly and Willy. Billy is a popular female first name and a very popular surname (source: 1990 U.S. Census). Displayed below is the baby name popularity trend for the girl's name Billy. Compare Billy with related baby names.
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