About the name Guillaume
Guillaume is a boy name with Proto-Germanic roots, literally “will + helmet”. It is related to William, which is where the meaning comes from.
It has a unique feel. Fewer than 5 US babies of either sex received it in 2025, so it's very rare right now. Its peak year since 1940 was 1997. Since 2000, 100% of US babies named Guillaume were boys.
Etymology
Shares its root with William, which comes from Proto-Germanic, meaning “will” + “helmet”.
Name meaning adapted from Wiktionary (“Guillaume”, “William”) by Wiktionary contributors, CC BY-SA 4.0.
- US rank 2025
- Not ranked
- In 2015
- Not ranked
- Babies in 2025
- Under 5
Popularity of Guillaume, 1940–2025
Latest SSA data: 2025.
Popularity data: U.S. Social Security Administration national baby names (public domain; names given to at least 5 babies of one sex per year).
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Guillaume
Your last name
born on your big day
7 LB 4 OZ · 20 IN
The Baby Kit
See Guillaume on a birth announcement
Birth announcements, shower invitations, nursery wall art and milestone cards, all personalized with Guillaume. Type your details once and print at home or at any print shop.
Names similar to Guillaume
Name meanings marked or linked “Wiktionary” are adapted from Wiktionary by Wiktionary contributors, CC BY-SA 4.0; each name page links its source entry.