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 | Russia, Bulgaria, Belarus, Kazakhstan, Ukraine |
| Konstantinow | Germany, Estonia, United States, Poland, Brazil |
| Konstantinov | Russia, Serbia, Bulgaria, Moldova, Uzbekistan |
| Constantinov | Russia, Bulgaria, Romania, Moldova, Brazil |