Cognomen Kusin (Cousin 
, Kusin 
, Кузин 
) , all around the world, is a common last name. The surname Kusin is habitual in Guadeloupe, where it is quite a common surname, France, and Malta (explore the name in all countries). Measured by absolute frequency, it is commonest in Russia, France, and the United States. Very seldom, Kusin is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Cousin | Belgium, France, United States, Indonesia, Philippines |
| Kusin | Malaysia, United States, Nigeria, Indonesia, Philippines |
| Кузин | Kazakhstan, Belarus, Ukraine, Azerbaijan, Russia |
| Кусин | Kazakhstan, Belarus, Ukraine, Kyrgyzstan, Russia |
| boris sergeevitsch kusin entomologist (born 1903) (b. 1903) |
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| eberhard kusin Austrian Capuchin and resistance fighter, CZ (b. 1915) |
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| jane kusin Dutch university teacher, NL (b. 1935) |
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| vladimir v. kusin (b. 1929) |
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| gary m. kusin American entrepreneur (born 1951), US (b. 1951) |
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| vasko kusin (b. 1943) |
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| vesna kusin (b. 1951) |
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| igor kusin Croatian linguist (b. 1963) |
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| faradiella mohd kusin researcher |
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