Family name Chastan (Chastan 
) , in all the world, is quite a rare surname. The surname Chastan is habitual in Martinique, where it is quite a common surname, France, where it is quite a rare surname, and Switzerland, where it is a rare surname. Not in comparison with a country's population, it is commonest in France, Martinique, and the United States. Very seldom, Chastan is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Chastan | Martinique, India, France, United States, Switzerland |
| jacques chastan French missionary, martyr, saint of the Catholic Church, FR (b. 1803) |
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| jules chastan FR (b. 1828) |
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| yves chastan French politician, FR (b. 1948) |
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| jules chastan composer |
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