Surname Riazantsev (Рязанцев 
, Riazantsev 
) , all over the world, is a common last name. The surname Riazantsev is habitual in Eastern Europe, particularly Russia, where it is quite a rare surname, Ukraine, and Belarus. In absolute terms, it is the most numerous in Russia, Ukraine, and Kazakhstan.
| VARIANT | COUNTRY |
|---|---|
| Рязанцев | Kazakhstan, Russia, Kyrgyzstan, Belarus, Ukraine |
| Riazantsev | Germany, Russia, United States, Ukraine, Lithuania |
Ryazantsev, Риазантсев, and Рйазанцев
| alexander riazantsev D.Sc. Kharkiv National University of Radioelectronics 2009 |
|