What does Billy mean?
Billy /bil-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 version, with the suffix -y, of Billie (Old English): originally a variant for William. Billy is also a derivative of Wilhelmina (Old German).
(female) Bealy, Beely, ..
(male) Billyon, Bilon, ..
How popular is Billy?
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 history of Billy for girls. Billy entered the list in 1900-1909 and reached its highest rank of #648 in the U.S. during 1930-1939, but is not in the Top 1000 at the moment. (2014 Birth Statistics)
Willa (#549 in recent rankings), Billie (#1726), Wilhelmina (#1876), Willie, Wilna, Wilma, Vilma, Billye and Billi are the popular related forms of Billy ranked in the Top 2000. These forms of Billy were at the height of their popularity 94 years ago (usage of 0.68%) and are now much less popular (usage 0.03%, 95% less). Billie is the continual favorite, though Willa is currently the more favored form, while versions like Billie are no longer trendy.
Billy is alike in pronunciation to Baila, Bailee▲, Bailei, Bailey, Bailie, Bailley, Baillie, Bailly, Baily, Bali, Bayla, Bayley, Bayly, Belia, Bella▲, Beula, Beyla, Bulah▼ and Byla. Other suggested similar names are Ally, Bell▼, Belle▼, Biddy, Biffy, Bindy, Binny, Birdy, Bizzy, Briley, Brily, Bryly (see Briley), Cally, Cilly, Colly, Delly, Dolly▼, Eily, Elly, Emilly, Gilly, Hally, Hilly, Holly▼, Jilly, Jully, Kally, Kelly▼, Lally, Lilly▲, Lily▲, Lolly, Mally, Melly, Milly, Molly, Nelly, Philly, Polly▼, Reilly▼, Sally▼, Tally, Tilly, Tully, Vally and Wally. These names tend to be less frequently used than Billy.