Cognomen Claassen (Claassen 
, ชั้น, Клаассен 
) , around the world, is a common last name. The family name Claassen is characteristic of Namibia, where it is quite a common surname, Netherlands, and South Africa. Measured by absolute frequency, the name is most common in South Africa, Netherlands, and Germany.
| pieter cornelis claassen 4 Jan 1788 Amsterdam - 6 Jan 1860 Amsterdam (b. 1788) |
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arthur claassen DE (b. 1859) |
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| hermine claassen 19 Mar 1828 Amsterdam - 7 Oct 1861 Straat Anjer o/b Cornelis Gips (b. 1828) |
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eugen claassen German publisher, DE (b. 1895) |
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| johannes claassen (b. 1835) |
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hilde claassen German publisher (1897-1988), DE (b. 1897) |
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| theodor claassen PL (b. 1854) |
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johan claassen South African rugby union footballer and coach (1929-2019), ZA (b. 1929) |
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| peter walter claassen American entomologist, US (b. 1886) |
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| franz claassen DE (b. 1881) |
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| wilhelm claassen (b. 1888) |
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| günther claassen PL (b. 1888) |
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| george claassen NL (b. 1890) |
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| harry louis claassen (b. 1892) |
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| richard claassen (b. 1900) |
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