Family name Клаз (Клаз 
) , all over the world, is a very rare cognomen. The surname Клаз 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 |
|---|---|
| Клаз | Ukraine, Russia |
| клаз, илья семёнович Soviet writer, BY (b. 1922) |
|