All around the world, Guilliam (Guilliam 
) is a very rare epicene first name. The first name Guilliam is characteristic of South Africa, where it is a very rare masculine name, Mexico, where it is an extremely rare epicene name, and the United States. Also, Guilliam is the last name as well as the forename.
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| Guilliam | United Kingdom, South Africa, United States, Colombia, Israel |
| guilliam mahu BE (b. 1517) |
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guilliam van nieuwelandt Flemish-Dutch painter (1584–1635), BE (b. 1584) |
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| guilliam van deynum Flemish painter (1575-1624), BE (b. 1575) |
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| guilliam de neve Dutch scientific instrument maker, BE (b. 1576) |
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| guilliam du gardijn Dutch painter (1595-1657), NL (b. 1595) |
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| guilliam de ville Dutch artist, approximately 1614-1672, NL (b. 1613) |
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| guilliam de vries 1624/1629-1675/1678 Nationality: Flemish (b. 1629) |
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| guilliam forchondt Flemish painter (1645-1677), BE (b. 1645) |
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| guilliam balthasar emants (1737-1805), NL (b. 1737) |
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| guilliam visagie First white settler in Namibia, ZA (b. 1751) |
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| guilliam johannes brutel de la rivière (b. 1855) |
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| guilliam van schoor Flemish painter |
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| guilliam sweerts |
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| guilliam subil |
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| guilliam van scharenburgh |
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