Cognomen Фабьянчук (Фабьянчук 
) , across the world, is a very rare family name. The last name Фабьянчук is characteristic of Eastern Europe, particularly Russia, where it is a very rare surname, and Ukraine, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Фабьянчук | Russia, Ukraine |
Fabianchuk, and Fabyanchuk