Guillaume is the French equivalent of William, which is of old Germanic origin from wille + helm (resolute protector).[1] It is an Oïl form corresponding to Occitan Guilhem and the Catalan form Guillem.
People with this given name include:
- William the Conqueror (c. 1028-1087), in French Guillaume le Conquérant, Norman conqueror of England
- William of Gellone (755-812/14), in French Guillaume d'Orange, Count of Toulouse and hero of the epic poem Chanson de Guillaume
- William IV, Grand Duke of Luxembourg (1852-1912)
- Guillaume V (disambiguation)
- Prince Guillaume of Luxembourg (born 1963)
- Guillaume Amontons (1663-1705), French scientific instrument inventor and physicist
- Guillaume Apollinaire (1880-1918), French poet, writer and art critic
- Guillaume Barazzone (born 1982), Italian-Swiss politician
- Guillaume de Salluste Du Bartas (1544-1590), Gascon Huguenot courtier and poet
- Guillaume du Bellay, seigneur de Langey (1491-1543), French diplomat and general
- Guillaume de Bellecombe (1728-1792), Governor General of Réunion, Saint-Domingue and Pondichéry, and a Republican revolutionary
- Guillaume Beuzelin (born 1979), French football coach and former player
- Guillaume Cornelis van Beverloo (1922-2010), Dutch artist better known under the pseudonym Corneille
- Guillaume Bigourdan (1851-1932), French astronomer
- Guillaume aux Blanches Mains (1135-1202), French Catholic cardinal
- Guillaume de Bonne-Carrere (1754-1825), French diplomat
- Guillaume Briçonnet (cardinal) (1445-1514), French cardinal and statesman
- Guillaume Briçonnet (Bishop of Meaux) (1472-1534), son of the cardinal
- Guillaume Brune (1764-1815), French soldier, Marshal of the Empire under Napoleon
- Guillaume Budé (1467-1540), French scholar and humanist
- Guillaume Cale (died 1358), French peasant rebel leader
- Guillaume Canet (born 1973), French actor
- Guillaume de Chartres (disambiguation)
- Guillaume Amfrye de Chaulieu (1639-1720), French writer
- Guillaume Cheval dit St-Jacques (1828-1880), Canadian politician
- Guillaume Cizeron (born 1994), French ice dancer
- Guillaume Costeley ((1530, possibly 1531-1606), French composer
- Guillaume Courtois (1628-1679), French painter and etcher
- Guillaume Coustou the Elder (1677-1746), French sculptor
- Guillaume Coustou the Younger (1716-1777), French sculptor, son of the above
- Guillaume Dah Zadi (born 1978), Ivorian footballer
- Guillaume Delisle (1675-1726), French cartographer
- Guillaume Daniel Delprat (1856-1937), Dutch-Australian metallurgist, mining engineer, and businessman
- Guillaume Depardieu (1971-2008), French actor
- Guillaume Deschênes-Thériault (born 1994), Canadian politician
- Guillaume Dode de la Brunerie
- Guillaume Dubois (1775-1851), French soldier and Marshal of France
- Guillaume Duchenne de Boulogne (1806-1875), French neurologist
- Guillaume Du Fay (1397-1474), Franco-Flemish composer and music theorist
- Guillaume Henri Dufour (1787-1875), Swiss general and topographer who presided over the convention that established the International Red Cross
- Guillaume Dufresne d'Arsel, 18th-century French colonial governor of Mauritius
- Guillaume Philibert Duhesme (1766-1815), French general, politician and writer, commander of Napoleon's Imperial Guard
- Guillaume Dupuytren (1777-1835), French anatomist and surgeon
- Guillaume Durand (c. 1230-1296), French canonist, liturgical writer, and Bishop of Mende
- Guillaume Durand (nephew) (died 1328 or 1330), French clergyman and canonist, nephew of the above
- Guillaume Durand (journalist) (born 1952), French journalist
- Guillaume Elmont (born 1981), Dutch judoka
- Guillaume d'Estouteville (c. 1412-1483), French aristocrat, archbishop, and cardinal
- Guillaume Faury (born 1968), French engineer and businessman, current chief executive officer at the aerospace corporation Airbus SE and current chairman of its civil aircraft division, Airbus SAS
- Guillaume Faye (1949-2019), French political theorist, journalist, writer, and leading member of the French New Right
- Guillaume Fichet (1433-c. 1480), French scholar
- Guillaume de Fondaumière (born 1971), French video game producer
- Guillaume Gallienne (born 1972), French actor, screenwriter, and film director
- Guillaume Gamelin Gaucher (1810-1885), Canadian businessman and politician
- Guillaume Geefs (1805-1883), Belgian sculptor
- Guillaume de Gisors (1219-1307), Norman lord
- Guillaume Gontard (born 1971), French politician
- Guillaume Gouffier, seigneur de Bonnivet (c. 1488-1525), French soldier
- Guillaume Groen van Prinsterer (1801-1876), Dutch politician and historian
- Guillaume Guiart, French chronicler and poet
- Guillaume Emmanuel Paul de Homem-Christo (born 1974), better known as Guy-Manuel, French musician, record producer, disc jockey, singer-songwriter, and composer
- Guillaume Knecht, rugby league footballer of the 1990s and 2000s
- Guillaume de Lamoignon de Blancmesnil (1683-1772), French magistrate
- Guillaume Latendresse (born 1887), Canadian retired National Hockey League player
- Guillaume LeBlanc (born 1962), Canadian former race walker
- Guillaume Lefebvre (born 1981), Canadian retired National Hockey League player
- Guillaume Le Gentil (1725-1792), French astronomer
- Guillaume Legrant (fl. 1405-1449), French composer
- Guillaume Lekeu (1870-1894), Belgian composer
- Guillaume de l'Hôpital (1661-1704), French mathematician
- Guillaume de Lorris (c. 1200-c. 1240), French scholar and poet
- Guillaume de Machaut (1300-1377), French composer and poet
- Guillaume Metten (1938-2020), Belgian diplomat
- Guillaume Mombaerts (1902-1993), Belgian pianist
- Guillaume Morel (1505-1564), French classical scholar
- Guillaume de Nogaret (c. 1260-1313), French politician, councilor and keeper of the seal to Philip IV of France
- Guillaume Patry, Canadian retired StarCraft professional player
- Guillaume Pellicier (c. 1490-1568), French prelate and diplomat
- Guillaume Postel (1510-1581), French linguist, orientalist, astronomer, Christian Kabbalist, diplomat, polyglot, professor, religious universalist, and writer
- Guillaume Poyet (c. 1473-1548), French magistrate
- Guillaume de Puylaurens (after 1200-1274 or later), French Latin chronicler
- Guillaume Raoux (born 1970), French former tennis player
- Guillaume Thomas François Raynal (1713-1796), French writer and man of letters
- Guillaume Rocheron (born 1981), Oscar-winning French visual effects supervisor
- Guillaume Rondelet (1507-1566), French professor of medicine at the University of Montpellier
- Guillaume Sarkozy (born 1951), French textile entrepreneur and vice-president of the MEDEF, the French union of employers
- Guillaume Sayer (1799-1868), Métis fur trader
- Guillaume de Sonnac (died 1250), French Grand Master of the Knights Templar from 1247 to 1250
- Guillaume Soro (born 1972), Ivorian politician
- Guillaume de Tonquédec (born 1966), French actor
- Guillaume du Vair (1556-1621), French bishop, author, lawyer, Magistrate of the Parliament, and Keeper of the Seals of France
- Guillaume Vigneault (born 1970), Canadian novelist
- Guillaume Warmuz (born 1970), French football coach and former goalkeeper
- Guillaume (surname)
- Guillaume (disambiguation)
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