Family name Guillaud (Guillaud 
, 吉约 
) , all around the world, is quite a rare last name. The last name Guillaud is characteristic of France, where it is quite a rare surname, Switzerland, where it is a rare surname, and Singapore. Not in comparison with a country's population, it is the most numerous in France, the United States, and Switzerland. Very seldom, Guillaud is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Guillaud | Singapore, Portugal, Switzerland, France, United States |
| 吉约 | China |
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suzette guillaud woman of letters and writer, FR (b. 1894) |
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| jean-alexandre guillaud (b. 1849) |
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édouard guillaud French admiral, FR (b. 1953) |
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| charles guillaud French painter (1925-2014), FR (b. 1925) |
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| jean-louis guillaud French journalist, FR (b. 1929) |
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| maurice guillaud French poet, philosopher and dramatist (1931-), FR (b. 1931) |
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| jacqueline guillaud French art historian (1934-1990), FR (b. 1934) |
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| roger guillaud French politician, FR (b. 1950) |
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| joëlle guillaud French actress (1950-1992), FR (b. 1950) |
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| hubert guillaud French journalist, FR (b. 1953) |
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| jean-pierre guillaud French politician, FR (b. 1959) |
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| benoît guillaud (b. 1952) |
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| emmanuel guillaud French artist, FR (b. 1970) |
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| martial guillaud researcher |
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| laurent guillaud researcher |
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