Given name & surname
Billy
“the determined protector”·“having a desire to protect”·“will”
Billy is a variant of Bill. In English use, Bill carries the interpretation “the determined protector.” Billy is a variant of Billie. In English use, Billie carries the interpretation “having a desire to protect.”
Meaning & origin
What it means
Billy is a variant of Bill. In English use, Bill carries the interpretation “the determined protector.” Billy is a variant of Billie. In English use, Billie carries the interpretation “having a desire to protect.” In English use, Billy is a diminutive of William. William’s elements mean “will” or “desire” and “helmet” or “protection.” “Determined protector” is a natural interpretation of that combination.
Explained through its name family
Where it comes from
In English use, Billy is a diminutive of William. William is an English form of a Germanic name brought to England by the Normans.
Explained through its name family
How it developed
In English usage, Billy is a diminutive of William. In English use, Billy is a diminutive of William. The shared background comes through William: William joins the Germanic elements wil and helm. The second element began with the concrete image of a helmet and also carried the broader idea of protection.
Combines direct and name-family evidence
The story
Published U.S. birth records include this spelling as early as 1880. This is the earliest published observation available here, rather than a date for the name’s origin. In English use, Billy is a diminutive of William. The history of William gives this family its wider story. William spread widely in England after the Norman Conquest, among people beyond the Norman ruling class. William remained prominent through the Middle Ages and became a royal name in England, Germany, and the Netherlands.
Combines direct and name-family evidence
Billy through the years
- Babies since 1880
- 389,665
- 384,233 boys · 5,432 girls
- Most popular year
- 1934
- 9,659 babies
- 2025
- 217
- #1,068 for boys · #7,554 for girls
- 2021–25 vs 2016–20
- −13%
- Easing
Where it’s given
By the numbers
In 2025, this name appeared in 203 U.S. birth records for boys, ranking No. 1,068 among boys’ names. Average annual use for boys was 16.9% lower in 2021–2025 than in 2016–2020. Its largest published annual count for boys was 9,562 in 1934. It also appeared in 14 birth records for girls in 2025. In 2025, Texas had the largest reported state-level birth count for boys with this name (29). Published U.S. population figures for this spelling include 173,433 as a first name in 2020; 3,183 as a surname in 2020.
From Social Security birth records and U.S. Census name counts for this exact spelling. Other spellings are counted separately.
Billy’s family of names
In English usage, Billy is a diminutive of William. Billy has a related form in Bill. Billy has a related form in Billie.
Inner ring: spellings · middle: nicknames and forms · outer: across languages.
Nicknames & forms 7
Diminutives, pet forms, short forms and variants used alongside the name.
Spellings & scripts 1
The same name written differently, including transliterations into other scripts.
Across languages 1
Equivalents and cognates in other languages, plus older forms it grew from.
See also 1
Names our sources mention alongside this one. They are related in story or meaning, not forms of this name.
People named Billy
- Billy GrahamAmerican Baptist evangelist (1918–2018)
- Billy WilderAustrian and American filmmaker (1906–2002)
- Billy JoelAmerican singer, songwriter, and pianist (born 1949)
- Billy ConnollyScottish actor and comedianborn 1942
- Billy CrystalAmerican actor, comedian, writer, producer, director and television presenter (born 1948)
- Billy ZaneAmerican actor (born 1966)
- Billy Ray CyrusAmerican country singer and actorborn 1961
- Billy IdolEnglish singerborn 1955
- Billy HughesAustralian politician (1862–1952), 7th Prime Minister of Australia from 1915 to 1923
Characters named Billy: Billy Bones (Stevenson's Treasure Island), Billy Butcher (fictional character on The Boys), Billy Bunter (fictional character created by Charles Hamilton (using the nom de plume of Frank Richards)), Billy Cranston (Power Rangers).
Listed by how widely each person is written about, which says nothing about the name itself.
Similar names
If you love Billy, these share its style, era, origin or sound, from outside its own family.
Ferdinand
“a courageous voyager”
>99% boys
Willie
“will” · “desire”
98% boys · 2% girls
Harry
“the ruler of an army” · “home”
>99% boys
Willis
“will” · “desire”
>99% boys
Willian
“will” · “desire”
>99% boys
Rudolph
Rudolph is a masculine given name from German.
>99% boys
Rolland
“from the renowned land”
>99% boys
Ralph
“wolt counsel”
>99% boys