Last name Kettler (Kettler 
, Кетлер 
, Кеттлер ) , in all the world, is quite a common family name. The family name Kettler is habitual in Germany, where it is quite a rare surname, Austria, and Hungary. Not in comparison with a country's population, it most frequently occurs in Germany, the United States, and France.
| VARIANT | COUNTRY |
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| Kettler | Germany, Austria, Hungary, United States, France |
| Кетлер | Kazakhstan, Russia, Ukraine |
| Кеттлер | Ukraine |
| conrad ii kettler (b. 1220) |
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| conrad iii kettler (b. 1285) |
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| conrad iv kettler (b. 1315) |
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| conrad i munking kettler (b. 1342) |
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| anna kettler (b. 1345) |
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| goswin von kettler (1400-1478), DE (b. 1400) |
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| margaretha kettler (b. 1395) |
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| margaretha kettler (b. 1400) |
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| cord kettler (b. 1418) |
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gotthard von kettler Duke of Courland and Semigallia (1517-1587), DE (b. 1517) |
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| casper kettler (b. 1510) |
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| conrad vi kettler (b. 1540) |
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jakob von kettler Duke of Courland, LV (b. 1610) |
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| theodorus kettler (b. 1584) |
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| elisabeth freiin kettler (born 1600) (b. 1600) |
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