Cognomen Hilaire (Hilaire 
, Hilarius 
, Илер 
) , in all the world, is a common family name. The surname Hilaire is characteristic of Latin America and the Caribbean, particularly Dominica, where it is a common surname, Saint Lucia, where it is quite a common surname, and Haiti (explore the name in all countries). Not in comparison with a country's population, it most frequently occurs in France, Haiti, and the United States. Also, Hilaire is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Hilaire | France, Cameroon, Ivory Coast, Haiti, Democratic Republic of the Congo |
| Hilarius | France, India, United States, Germany, Indonesia |
| Илер | Russia, Bulgaria, Kyrgyzstan |
| هيلاري | Iraq |
| antoine-théodore de hilaire BE (b. 1650) |
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| jean françois hilaire French official (1750-1825), FR (b. 1750) |
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| jacques bernard hilaire French politician, FR (b. 1753) |
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| jean baptiste hilaire French painter, FR (b. 1753) |
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| charles joseph francois villain de st. hilaire (b. 1759) |
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camille hilaire french painter, FR (b. 1916) |
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| andrew hilaire American jazz drummers, US (b. 1899) |
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| georges hilaire French official, FR (b. 1900) |
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laurent hilaire French ballet dancer, FR (b. 1962) |
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| yves-marie hilaire French historian (1927-2014), FR (b. 1927) |
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| jean hilaire French legal historian (b. 1927) |
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ernest hilaire Saint Lucian politician, LC |
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| jeannot hilaire Haitian writer, HT (b. 1945) |
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| jean-louis hilaire French politician, FR (b. 1945) |
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| guy hilaire French politician, FR (b. 1949) |
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