Cognomen Ержанов (Ержанов 
, Yerzhanov 
, Erzhanov 
) , throughout the world, is quite a common surname. The last name Ержанов is habitual in Kazakhstan, where it is quite a common surname, Azerbaijan, and Slovakia, where it is a rare surname. Measured by absolute frequency, it is the most numerous in Kazakhstan, Azerbaijan, and Russia. Very seldom, Ержанов is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Ержанов | Ukraine, Kazakhstan, Russia, Azerbaijan, Kyrgyzstan |
| Yerzhanov | Kazakhstan, Slovakia, United Kingdom, United States, China |
| Erzhanov | Ukraine, Estonia, Kazakhstan, Russia, United States |
| Erjanov | Kazakhstan |
| ержанов, накып KZ (b. 1887) |
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| ержанов, манарбек actor, KZ (b. 1901) |
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| боран ержанов KZ (b. 1896) |
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| ахмет ержанов KZ (b. 1922) |
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| жақан сүлейменұлы ержанов KZ (b. 1922) |
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| ержанов, галихан нурмуханбетович KZ (b. 1938) |
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| мейірбек ержанов KZ (b. 1940) |
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| қазыбек бекмағанбетұлы ержанов KZ (b. 1942) |
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| самиғолла ибатоллаұлы ержанов KZ (b. 1943) |
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| мұхтар салтайұлы ержанов KZ (b. 1950) |
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| нұрлан тельманұлы ержанов KZ (b. 1962) |
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| омарқан нұрқанұлы ержанов KZ (b. 1963) |
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| әділхан ержанов KZ (b. 1982) |
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Али, Едил, Ерик, Есен, Саят, Талғат, Таир, Улан, Юрий, Канат, Каныш, Камал, Кабыл, Кадыр, Каким, Кенес, Манас, Манат, Малик, Марат, Мирам, Мирас, Омар, Нияз, Диас, Гани, Жан, Иса, Рза, Кази, Макс, Мади, Абди, Абил, Абай, Абат, Медет, Алим, Аман, Амир, Азиз, Азат, Асан, Асет, Ахан, Баха, Бақыт, Бека, Акан, and Мейир