Cognomen Castner (Castner 
) , throughout the world, is quite a rare family name. The family name Castner is characteristic of the United States, where it is a rare surname, Australia, and Germany.
| VARIANT | COUNTRY |
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| Castner | Germany, Australia, Switzerland, United States, Canada |
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caspar castner German missionary, DE (b. 1655) |
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| jan filip castner (b. 1766) |
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elvira castner PL (b. 1844) |
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joseph compton castner United States Army general, US (b. 1869) |
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| karl castner DE (b. 1819) |
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| castner hanway (b. 1821) |
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| adalbert castner DE (b. 1832) |
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| sigmund hieronymus castner DE (b. 1835) |
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paul castner American baseball player, US (b. 1897) |
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| samuel joseph castner American photographer (1878-1960) (b. 1878) |
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| michael castner American journalist, US (b. 1901) |
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| laurence castner American fencer, US (b. 1902) |
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| henry w. castner cartographer, US (b. 1932) |
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| daniela castner German psychologist and writer, DE (b. 1948) |
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| thilo castner (b. 1953) |
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