Cognomen Casmir (Casmir 
, Касмир) , all over the world, is quite a common last name. The cognomen Casmir is habitual in Sub-Saharan Africa, particularly Nigeria, where it is quite a rare surname, Tanzania, and Kenya, where it is a rare surname. Also, Casmir is the forename as well as the last name.
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| Casmir | Philippines, Democratic Republic of the Congo, Cameroon, Tanzania, Nigeria |
| gustav casmir German fencer, DE (b. 1874) |
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| erwin casmir German fencer, DE (b. 1895) |
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| john casmir American jazz clarinetist, US (b. 1898) |
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| norman casmir German fencer, DE (b. 1930) |
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| thorsten casmir (b. 1960) |
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| edinah casmir researcher |
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