Cognomen Костецкиы (Костецкиы 
) , all around the world, is an extremely rare family name. The surname Костецкиы is habitual in Eastern Europe, particularly Russia, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Костецкиы | Russia |
Kosteckiy, Kostetskiy, and Kostetskyy