Family name Kudrjavcev (Кудрявцев 
, Kudrjavcev 
) , all over the world, is a common last name. The cognomen Kudrjavcev is habitual in Russia, where it is quite a common surname, Belarus, and Kazakhstan, where it is quite a rare surname. Measured by absolute frequency, it most frequently occurs in Russia, Ukraine, and Kazakhstan.
| VARIANT | COUNTRY |
|---|---|
| Кудрявцев | Kazakhstan, Belarus, Kyrgyzstan, Russia, Ukraine |
| Kudrjavcev | Latvia, Germany, Czechia, Indonesia, Hungary |
Koudriavtsev, Kudriavtsev, Kudrjavzev, Kudrjawzew, Kudrjávcev, Kudryavtsev, and Кудрйавцев
| p. f. kudrjavcev (b. 1863) |
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| sergej michajlovic̆ kudrjavcev (b. 1915) |
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| anatolij kudrjavcev HR (b. 1930) |
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