Last name Châtelain (Chatelain 
, Châtelain 
) , worldwide, is a common family name. The family name Châtelain is habitual in France, where it is quite a common surname, Switzerland, and Eswatini, where it is quite a rare surname. In absolute terms, this name is the most popular in France, the United States, and Switzerland. Much less frequently, Châtelain is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Chatelain | Canada, France, United States, Democratic Republic of the Congo, Switzerland |
| Châtelain | Canada, France, United States, Belgium, Switzerland |
Castelain, Castellan, Chastelain, and Chatelaine
| françoise châtelain FR (b. 1654) |
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nicolas châtelain NL (b. 1769) |
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| jean-jacques châtelain Swiss botanist (1736-1822), CH (b. 1736) |
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| jean châtelain FR (b. 1765) |
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| rené-théophile châtelain French journalist, FR (b. 1790) |
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| jean marie châtelain FR (b. 1789) |
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marie joseph châtelain French soldier, FR (b. 1851) |
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| marie louise de châtelain (b. 1794) |
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| louis châtelain Swiss architect (1805-1885), CH (b. 1805) |
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| auguste châtelain Swiss physician and translator (b. 1838) |
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| léo châtelain Swiss architect (1839-1913), CH (b. 1839) |
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joseph châtelain FR (b. 1900) |
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| alfred joseph châtelain FR (b. 1863) |
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| yves châtelain 1902-1975; ISNI 0000 0000 7835 3659; VIAF 39088314, FR (b. 1902) |
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| nicolas châtelain RU (b. 1913) |
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Luc, Sandra, Sabine, Sylvie, Alexis, André, Adrien, Astrid, Audrey, Audray, Carine, Coline, Claude, Claire, Basile, Pascal, Pierre, Romain, Denise, Gilles, Lorine, Jerome, Michel, Marion, Marine, Julie, Marc, Alex, Alix, Anne, Paul, Liza, Jean, Nina, Eric, Hugo, Julien, Yann, Sarah, Serge, Alain, Renel, Diane, Dylan, Glenn, Laura, Loïs, Lukas, Yves, and Thomas