Around the globe, Guilhaume (Guilhaume 
) is a very rare boy's given name. The given name Guilhaume is habitual in Western Europe, particularly France, where it is a rare male name. Also, Guilhaume is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Guilhaume | France, Brazil, United States |
| guilhaume foujols FR (b. 1759) |
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| guilhaume dhuguet FR (b. 1864) |
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| guilhaume boryes 1539 Villeneuve d'Agen, Lot et Garonne - |
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| guilhaume castelain |
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| guilhaume duffoure FR |
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