Last name Usin (Usin 
, Усин 
) , all over the world, is quite a common family name. The surname Usin is habitual in Estonia, where it is quite a common surname, Malaysia, where it is quite a rare surname, and Indonesia. Measured by absolute frequency, it is commonest in South-eastern Asia, particularly Indonesia, Malaysia, and Philippines. Likewise, Usin is the forename as well as the last name.
| jaan usin Estonian military personnel, EE (b. 1887) |
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| august usin (b. 1881) |
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| usin kerim Bulgarian Romani poet (b. 1929) |
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| simpo usin Indonesian political candidate, ID |
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