Family name Chastelet (Chatelet 
, Chastelet 
) , across the world, is quite a rare surname. The cognomen Chastelet is characteristic of Western Europe, particularly France, where it is quite a rare surname, Belgium, where it is a rare surname, and Netherlands. Very seldom, Chastelet is the forename as well as the last name.
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| Chatelet | Belgium, Germany, Switzerland, France, Argentina |
| Chastelet | Canada, Netherlands, United States |
| jean de chastelet Dutch geologist, NL (b. 1578) |
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| nicolas chastelet French singer, FR (b. 1593) |
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| daniel hay du chastelet French mathematician (1596-1671), FR (b. 1596) |
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| florent-claude du chastelet (b. 1695) |
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| antoine ii du chastelet, baron du chatelet et de châteauneuf - 25 Jan 1577 |
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| gilles de chastelet catholic bishop |
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| jacques du chastelet - 31 May 1551 |
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| philibert du chastelet, seigneur de sorcy de doncourt de saint-amand - Bef 29 Sep 1478 |
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| renaud du chastelet, comte de vignory - Bef 21 Apr 1493 |
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| isabelle du chastelet - Abt 1485 |
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| jeanne du chastelet - 22 Jan 1462 |
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| christine du chastelet - 3 Jun 1663 |
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| anne de chastelet |
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| gilles de chastelet |
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| isabelle du chastelet |
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