Surname Kostowa (Костова 
, Kostowa 
) , in all the world, is quite a common family name. The cognomen Kostowa is characteristic of Eastern Europe, particularly Bulgaria, where it is a common surname, Ukraine, where it is quite a rare surname, and Russia, where it is a rare surname.
| VARIANT | COUNTRY |
|---|---|
| Костова | Kazakhstan, Ukraine, Belarus, Bulgaria, Russia |
| Kostowa | Germany, Bulgaria |