Surname Куач (Kuach 
, Куач 
, Kuač 
) , around the world, is a rare last name. The surname Куач is characteristic of South Sudan, where it is quite a rare surname, Sudan, where it is a rare surname, and Croatia. Much less frequently, Куач is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Kuach | Sudan, Australia, United States, South Sudan, France |
| Куач | Russia, Ukraine |
| Kuač | Croatia |