Surname Guilhermy (Guilhermy 
) , in the entire world, is an extremely rare cognomen. The last name Guilhermy is characteristic of Latin America and the Caribbean, particularly Brazil, where it is an extremely rare surname. Predominantly, Guilhermy is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Guilhermy | Brazil |
| jean-françois-césar de guilhermy French politician, FR (b. 1761) |
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| ferdinand de guilhermy FR (b. 1809) |
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| elesban de guilhermy (b. 1818) |
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