Cognomen Guillerm (Guillerm 
) , around the globe, is quite a rare family name. The surname Guillerm is habitual in France, where it is quite a rare surname, Belarus, where it is a rare surname, and Switzerland. Measured by absolute frequency, it most frequently occurs in France, the United States, and Spain. Very seldom, Guillerm is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Guillerm | Belarus, Canada, Spain, France, United States |
| jules guillerm FR (b. 1853) |
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| henri guillerm French priest and organist (1872-1932), FR (b. 1872) |
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| alain guillerm French historian (1944-2005), FR (b. 1944) |
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| yves guillerm French politician, FR (b. 1950) |
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| jean-pierre guillerm (b. 1940) |
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| luc-christophe guillerm French psychiatrist, FR (b. 1962) |
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| elisabeth guillerm French politician, FR (b. 1965) |
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| françoise guillerm French politician, FR (b. 1965) |
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| johann le guillerm (b. 1969) |
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| nathalie guillerm researcher |
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| emmanuel guillerm researcher |
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| jean-christophe guillerm FR (b. 1973) |
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| vincent guillerm researcher ORCID ID = 0000-0003-3460-223X (b. 1983) |
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| maurice guillerm |
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| pauline guillerm FR (b. 1980) |
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