Family name Castelin (Castelin 
) , across the world, is a rare surname. The family name Castelin is characteristic of Luxembourg, where it is quite a rare surname, Venezuela, where it is a rare surname, and France. Measured by absolute frequency, it most frequently occurs in France, Venezuela, and the United States. Much less frequently, Castelin is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Castelin | Democratic Republic of the Congo, France, Venezuela, United States, Luxembourg |
| edward castelin Castelin, Edward (<em>fl. </em>1554–1578), merchant (b. 1554) |
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andré castelin French politician and journalist, FR (b. 1858) |
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| karel castelin (1903-1981), CZ (b. 1903) |
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| robert castelin French cyclist, FR (b. 1920) |
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