Cognomen Kastel (Castel 
, Kastel 
, Kostel 
) , in the entire world, is a common family name. The last name Kastel is characteristic of Reunion, where it is quite a common surname, Mauritius, and France. Not in comparison with a country's population, the name is most common in France, Philippines, and the United States. Much less frequently, Kastel is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Castel | United States, Spain, France, Philippines, Democratic Republic of the Congo |
| Kastel | Argentina, United States, France, Democratic Republic of the Congo, Brazil |
| Kostel | United Kingdom, United States, Spain, Germany, Canada |
| Кастель | Ukraine, Belarus, Russia |
| phillip kastel American mobster (b. 1893) |
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zoran kastel Croatian footballer, HR (b. 1972) |
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| paul kastel German-Canadian art dealer, CA (b. 1927) |
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| emilie kastel (b. 1920) |
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| roger kastel American artist, US (b. 1932) |
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| galina richardovna kastel Soviet astronomer (b. 1946) |
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| kastel bahri ID (b. 1954) |
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| norma kastel actress |
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| michaela kastel Austrian writer, AT (b. 1987) |
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| johann chrysostomus schenk von kastel CH |
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| emilie kastel |
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| dietegen ii. of kastel |
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| ulrich schenk von kastel CH |
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| matilda kastel SE (b. 1984) |
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| viktor kastel RS (b. 1999) |
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