Throughout the world, Константинов (Константинов 
, Konstantinow 
, Konstantinov 
) is a very rare masculine first name. The first name Константинов is characteristic of Bulgaria, where it is a rare boy's name, Russia, where it is a very rare male name, and China, where it is an extremely rare male name. Much more prevalently, Константинов is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Константинов | Bulgaria, Belarus, Kazakhstan, Russia, Ukraine |
| Konstantinow | Brazil, Poland, Estonia, United States, Germany |
| Konstantinov | Moldova, Serbia, Bulgaria, Russia, Uzbekistan |
| Constantinov | Brazil, Moldova, Bulgaria, Romania, Russia |