Family name Cloos (Cloos 
, Клоос 
) , globally, is quite a rare surname. The cognomen Cloos is habitual in Luxembourg, where it is quite a common surname, Denmark, where it is quite a rare surname, and Belgium. Measured by absolute frequency, it most frequently occurs in Germany, the United States, and Denmark.
| heinrich cloos (1559-1629), CH (b. 1559) |
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| paul wilhelm cloos Swedish cellist, SE (b. 1745) |
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| nicolaus cloos FR (b. 1746) |
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| gustaf adolf cloos SE (b. 1782) |
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christian cloos (b. 1863) |
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| ulrich cloos (b. 1852) |
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| hans cloos German geologist, DE (b. 1885) |
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| consuelo cloos US (b. 1887) |
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| ernst cloos American geologist, DE (b. 1898) |
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| heinrich cloos (b. 1896) |
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| frieda cloos DE (b. 1898) |
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| friedrich cloos DE (b. 1909) |
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| boy cloos Luxembourgish painter, LU (b. 1928) |
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| hans-peter cloos German theater and film director, DE (b. 1949) |
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| paul a cloos researcher |
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