Family name Klaasse (Klaasse 
) , all around the world, is a rare cognomen. The surname Klaasse is habitual in Netherlands, where it is quite a rare surname, South Africa, where it is a rare surname, and Belgium, where it is a very rare surname. In absolute terms, the name is most common in Netherlands, South Africa, and the United States.
| VARIANT | COUNTRY |
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| Klaasse | Netherlands, Belgium, Canada, United States, South Africa |
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piet klaasse Dutch illustrator (1918–2001), NL (b. 1918) |
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jakob klaasse Dutch composer and record producer, NL (b. 1948) |
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| cornelis abraham klaasse (b. 1903) |
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| kamiel klaasse Kamiel Klaasse is artist geboren op 1967 te Eemnes, NL (b. 1967) |
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| ralph klaasse Ph.D. Universiteit Utrecht 2017 |
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