Family name Cosijn (Cosijn 
) , worldwide, is a rare cognomen. The last name Cosijn is habitual in Netherlands, where it is quite a rare surname, Belgium, where it is a rare surname, and Canada, where it is a very rare surname. Very seldom, Cosijn is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Cosijn | Belgium, United Kingdom, Netherlands, Canada, South Africa |
| pieter cosijn Dutch painter, NL (b. 1630) |
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p. j. cosijn Dutch linguist (1840-1899), NL (b. 1840) |
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lies cosijn Dutch artist and ceramist, NL (b. 1931) |
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hanneke cosijn NL (b. 1957) |
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| willem nicolaas cosijn Dutch navy officer and diplomat, NL (b. 1965) |
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