Family name Guillou (Guillou 
, غيو 
, Гийу 
) , globally, is a common surname. The cognomen Guillou is habitual in Guernsey, where it is quite a common surname, France, and Guadeloupe (explore the name in all countries). In absolute terms, the name is most common in France, the Democratic Republic of the Congo, and the United States. Much less frequently, Guillou is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Guillou | Ivory Coast, Democratic Republic of the Congo, United States, France, Canada |
| غيو | Saudi Arabia |
| Гийу | Russia |
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joseph guillou French composer and music educator, FR (b. 1787) |
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| rené marie guillou French politician, FR (b. 1747) |
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| olivier guillou FR (b. 1762) |
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| teófilo josé jaime maría le guillou founder of Vieques municipality, Puerto Rico (1790-1843), FR (b. 1790) |
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alfred guillou French painter (1844-1926), FR (b. 1844) |
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| allain jacques guillou FR (b. 1799) |
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| constant guillou American photographer, US (b. 1812) |
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| charles guillou American military physician, US (b. 1813) |
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| corantin maria le guillou (b. 1804) |
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eugénie guillou FR (b. 1861) |
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| jean guillou French catholic priest and composer (1830-1887), FR (b. 1830) |
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léon guillou French songwriter, FR (b. 1929) |
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| yves guillou French politician, FR (b. 1880) |
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jean guillou French composer, organist, pianist, FR (b. 1930) |
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serge guillou French artist, FR (b. 1932) |
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