Family name Семеньчук (Семеньчук 
) , across the world, is a very rare surname. The cognomen Семеньчук is habitual in Eastern Europe, particularly Belarus, where it is a rare surname, Ukraine, where it is a very rare surname, and Russia, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Семеньчук | Russia, Ukraine, Belarus |
Semenchuk, and Sementchouk