Family name Claesz (Клас 
, 克拉斯 
, Claesz) , around the globe, is a very rare surname. The family name Claesz is characteristic of Ukraine, where it is a very rare surname, Kyrgyzstan, and Russia, where it is an extremely rare surname. Likewise, Claesz is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Клас | Kazakhstan, Ukraine, Russia, Kyrgyzstan |
| 克拉斯 | China |
| cornelis claesz Dutch printer and bookseller, BE (b. 1546) |
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pieter claesz painter from the Northern Netherlands (c.1596–1660), BE (b. 1596) |
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| leendert claesz Dutch 1580–1609 F:0, DE (b. 1580) |
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| paulus van arnhem claesz Dutch scientific instrument maker (b. 1600) |
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| pieter anthonie claesz Dutch artist |
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| jan claesz Dutch artist, NL |
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| abraham claesz |
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