Cognomen Gerdt (Gerdt 
, Герт 
, Гердт ) , throughout the world, is quite a rare surname. The cognomen Gerdt is characteristic of Kazakhstan, where it is quite a common surname, Finland, where it is quite a rare surname, and Kyrgyzstan. Measured by absolute frequency, it most frequently occurs in Kazakhstan, Russia, and Germany. Much less frequently, Gerdt is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Gerdt | Russia, Sweden, United States, Finland, Germany |
| Гердт, Герт | Kazakhstan, Russia, Kyrgyzstan, Belarus, Ukraine |
| gerdt josting (b. 1550) |
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| gerdt gröninger DE (b. 1550) |
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| gerdt anton rehnskiöld Swedish military personnel, SE (b. 1610) |
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| gerdt benningk (b. 1600) |
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| gerdt störning SE (b. 1609) |
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| gerdt ehrenschantz SE (b. 1663) |
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gerdt hardorff German painter (1769-1864), DE (b. 1769) |
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| gerdt adolph thorssman SE (b. 1770) |
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paul gerdt Russian ballet dancer, FI (b. 1844) |
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| gerdt iunior hardorff (b. 1800) |
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gerdt hallberg Swedish architect (1861-1917), SE (b. 1861) |
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gerdt august lundeberg Swedish military personnel (1868-1948), SE (b. 1868) |
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gerdt henrik meyer bruun Norwegian politician (1873-1945), NO (b. 1873) |
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gerdt marian siewert German painter (1920-1992), DE (b. 1920) |
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tuomas gerdt Finnish Continuation War veteran, last living Knight of the Mannerheim Cross, FI (b. 1922) |
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