Last name Kastl (Kastl 
) , all around the world, is quite a rare family name. The family name Kastl is habitual in Germany, where it is quite a rare surname, Austria, and Czechia. Not in comparison with a country's population, this name is the most popular in Germany, the United States, and Austria.
| VARIANT | COUNTRY |
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| Kastl | Czechia, Italy, Austria, United States, Germany |
| peter of kastl German translator (b. 1400) |
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| johannes von kastl (b. 1400) |
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ludwig kastl German economist, DE (b. 1878) |
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| dragan kastl association football player (1893-1975), HR (b. 1893) |
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| josef kastl (b. 1889) |
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| vojtěch kastl Czech footballer (1908-1968) (b. 1908) |
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| jörg kastl German jurist (1922-2014), DE (b. 1922) |
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| sonja kastl Croatian film and stage actress, HR (b. 1929) |
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johnny kastl American actor, US |
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| herbert kastl (b. 1925) |
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| josef kastl (b. 1931) |
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| otto kastl German association football player, DE (b. 1947) |
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| barbara kastl-salaris German sculptor, DE (b. 1955) |
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| josef kastl (b. 1949) |
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| jan kastl (b. 1949) |
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