Surname Rengach (Rengach 
, Ренгач 
) , in the entire world, is a rare family name. The surname Rengach is habitual in Ukraine, where it is a rare surname, Russia, and Argentina, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Rengach | Russia, Argentina, Ukraine, United States |
| Ренгач | Kazakhstan, Russia, Ukraine |