Family name Claas (Claas 
) , throughout the world, is quite a rare surname. The surname Claas is characteristic of Germany, where it is quite a rare surname, Israel, and Netherlands, where it is a rare surname. In absolute terms, it is the most numerous in Germany, Brazil, and the United States. Likewise, Claas is the forename as well as the last name.
| wilhelm claas German historian and photographer, DE (b. 1885) |
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| august claas German entrepreneur, DE (b. 1887) |
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| paul claas German bomber pilot and Knight's Cross recipient, IR (b. 1908) |
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| j. claas (b. 1916) |
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cristin claas band, DE (b. 1977) |
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| helmut claas DE (b. 1926) |
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| gerhard claas DE (b. 1928) |
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| herbert claas German sociologist, DE (b. 1941) |
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| regina claas DE (b. 1955) |
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| steven a claas researcher |
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| frans h j claas researcher |
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| eric c.j. claas researcher (ORCID 0000-0003-2632-0902) |
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| frans claas university teacher at Leiden University |
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| willem jan claas Ph.D. Universiteit Utrecht 1951 |
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| willem jan claas Ph.D. Universiteit Leiden 1977 |
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