What does Billy mean?
Billy \b(il)-ly\ as a name for girls (also used more commonly as boys' name Billy). Billy's roots are Old English and Old German, and the meaning of the name Billy is "determined protector". Billy is a derivative of Billie (Old English): originally a nickname for William. Billy is also a derivative of Wilhelmina (Old German).
Billy▼ has 22 more related variations via Billie, Wilhelmina: Billa, Billiejo, Billina, Ellma, Elma▼, Helma, Min, Mina▼, Minna▼, Minny, Valma, Velma▼, Vilma▼, Wileen, Willa▼, Willeen, Willene▼, Willie▼, Willy, Wilma▼, Wilna and Wylma.
Billy is a very prominent first name for females (#1481 out of 4276, Top 35%) and also a very prominent last name for both adults and children (#9147 out of 150436, Top 6%). (2000 U.S. Census)
Charted below is the baby name popularity of Billy for girls. Billy entered the list in 1920-1929 and reached its highest rank of #694 in the U.S. during 1930-1939, but is not in the Top 1000 at the moment. (2014 Birth Statistics)
Willa (#549 in 2014), Mina (#687), Wilhelmina, Willene, Wilma, Willie, Vilma, Minna, Billye, Elma, Helma, Billie and Velma are the popular related forms of Billy ranked in the Top 1000. These girl names were at the height of their popularity during 1920-1929 (usage of 0.4794%) and are now much less popular (usage 0.0546%, down 88.6%), with versions such as Billy, Billye, Elma, Billie and Velma falling out of fashion. Below is a charted comparison of the popularity of the girl name Billy and affiliated names. (2014 Birth Statistics)
Billy▼ is alike in pronunciation to Bailey, Bailley, Bailly, Baily, Bayly and Bella. Other suggested similar baby names are Bell▼, Belle▼, Cilly, Gilly, Hilly, Jilly, Lilly, Milly and Tilly. These names tend to be less frequently used than Billy.