Last name Rjazanova (Рязанова 
, Rjazanova 
) , all around the world, is a common cognomen. The last name Rjazanova is habitual in Russia, where it is quite a common surname, Kazakhstan, where it is quite a rare surname, and Ukraine.
| VARIANT | COUNTRY |
|---|---|
| Рязанова | Azerbaijan, Kazakhstan, Russia, Belarus, Ukraine |
| Rjazanova | Azerbaijan, Germany, Estonia, Belarus, Latvia |
| l.v. rjazanova botanist |
|