Cognomen Крайнов (Крайнов 
, Krainov 
, Krajnov 
) , in all the world, is a common family name. The last name Крайнов is habitual in Russia, where it is quite a rare surname, Kazakhstan, and Ukraine, where it is a rare surname.
| VARIANT | COUNTRY |
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| Крайнов | Kyrgyzstan, Kazakhstan, Belarus, Ukraine, Russia |
| Krainov | Russia, China, United States, Estonia, Bulgaria |
| Krajnov | Israel, Germany |
| крайнов, дмитрий александрович Soviet archeologist, RU (b. 1904) |
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| крайнов, иван дмитриевич RU (b. 1911) |
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| станислав романович крайнов Soviet hydrologist (1928-2007), RU (b. 1928) |
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| крайнов, александр иосифович RU (b. 1919) |
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| крайнов, степан матвеевич RU (b. 1920) |
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| крайнов, борис сергеевич RU (b. 1923) |
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| костадин крайнов BG (b. 1932) |
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| крайнов, юрий дмитриевич RU (b. 1937) |
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| григорий никандрович крайнов RU (b. 1958) |
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| александър крайнов volleyball player, BG (b. 1979) |
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| евгений александрович крайнов Russian actor, RU (b. 1984) |
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