Cognomen Rjazancev (Рязанцев 
, Rjazancev 
) , across the world, is a common family name. The surname Rjazancev is habitual in Eastern Europe, particularly Russia, where it is quite a rare surname, Ukraine, and Belarus. In absolute terms, this name is the most popular in Russia, Ukraine, and Kazakhstan.
| VARIANT | COUNTRY |
|---|---|
| Рязанцев | Kazakhstan, Russia, Kyrgyzstan, Belarus, Ukraine |
| Rjazancev | Germany, Slovenia |
| aleksander rjazancev SI (b. 1924) |
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| igorʹ pavlovič rjazancev RU (b. 1959) |
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| boris rjazancev SI |
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