Given name & surname
Gwilym
“the determined protector”·“will”·“desire”
Gwilym is a variant of Guillaume. In French use, Guillaume carries the interpretation “the determined protector.” Gwilym is a form of William. William’s elements mean “will” or “desire” and “helmet” or “protection.” “Determined protector” is a natural interpretation of that combination.
Meaning & origin
What it means
Gwilym is a variant of Guillaume. In French use, Guillaume carries the interpretation “the determined protector.” Gwilym is a form 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
Gwilym is a form 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 Welsh usage, Gwilym developed from WILLAHELM. Gwilym is a form 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 2005. This is the earliest published observation available here, rather than a date for the name’s origin. Gwilym is a form 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
Gwilym through the years
- Babies since 1880
- 5
- 5 boys · 0 girls
- Most popular year
- 2005
- 5 babies
- 2025
- 0
- Outside the ranked list
- 2021–25 vs 2016–20
- —
- Too few births to compare
By the numbers
The most recent published U.S. birth count for boys is 5 in 2005. Later missing counts do not mean the name went unused.
From Social Security birth records and U.S. Census name counts for this exact spelling. Other spellings are counted separately.
Gwilym’s family of names
Gwilym shares a linguistic root with William. In Welsh usage, Gwilym has a conventional equivalent in the Spanish form Guillermo. Gwilym is a form of William.
Inner ring: nicknames and forms · outer: across languages.
Around the world
Gwilym has relatives in 7 languages.
8 related names in 7 languages. Point at a dot, or tab to the map and use the arrow keys.
Nicknames & forms 1
Diminutives, pet forms, short forms and variants used alongside the name.
Across languages 18
Equivalents and cognates in other languages, plus older forms it grew from.
People named Gwilym
- Gwilym LeeBritish actorborn 1983
- Gwilym Lloyd GeorgeBritish politician (1894-1967)
- Gwilym JenkinsWelsh statistician (1932–1982)
- Ivor ThomasBritish Army general (1893–1972)
- Gwilym Peter LewisBritish botanistborn 1952
- G. E. L. OwenWelsh philosopher (1922–1982)
- Gwilym PrichardWelsh artist (1931–2015)
- Gwilym RhyfelWelsh poet
- Gwilym Hugh LewisBritish flying ace (1897-1996)
Listed by how widely each person is written about, which says nothing about the name itself.
Similar names
If you love Gwilym, these share its style, era, origin or sound, from outside its own family.