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Billie as a masculine name originated as a diminutive form of William, derived from Germanic elements meaning "will" or "determination" and "helmet" or "protection." While more commonly recognized as a feminine name today, Billie has historical precedence as a male name, particularly in the early to mid-20th century. Notable male bearers include jazz musician Billie Holiday (born Eleanora but adopted the masculine spelling) and various athletes and musicians. The name conveys a friendly, approachable quality with vintage charm. Though its popularity for boys has declined significantly since the 1960s, it maintains appeal for parents drawn to gender-neutral naming options with traditional roots and a casual, unpretentious character.

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The name Billie is currently ranked #990 in U.S. births. and peaked for boys at #122 in 1929. It is currently rising in popularity. Billie is also used for girls, ranking #691 in 2025 (more popular).

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The name Billie is a girl's name of English origin meaning "resolute protection".

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Billie is a tomboy nickname name, part of the growing trend for using boyish nicknames for girls and now destined for stardom along with its most famous contemporary bearer, music sensation Billie Eilish.
 To track its path from blue to pink, Billie was 100% male in 1880, was 55% female just a decade later, in the girls' Top 100 by 1928, and is now overwhelmingly female.
 Billie is a possible retro choice for fans of jazz great Billie Holiday, born Eleanora, and a very contemporary choice for teen singer Billie Eilish -- born Billie Eilish Pirate Baird O'Connell. Other conceivable namesakes are The Wizard of Oz's Glinda--Billie Burke (born Mary William), silent screen star Billie Dove (born Bertha), actresses Billie Whitelaw and Billie Piper (born Lianne) and tennis legend Billie Jean King (born Billie). Another cultural reference is the Michael Jackson hit song 'Billie Jean.'
 Billie was picked for their daughters by Carrie Fisher, My Name is Earl actor Ethan Suplee, and Rebecca Gayheart and Eric Dane.

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The name Billie is currently ranked #691 in U.S. births. and peaked for girls at #79 in 1930. The name is most popular in BILLIE, BILLIE, and BILLIE. Billie is occasionally used for boys in 2025.

Year	US rank	Births	Per million
2014	—	0	0
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2020	—	0	0
2021	—	0	0
2022	—	0	0
2023	—	0	0
2024	—	0	0
2025	—	0	0

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