The austrian family descendant from Carolu Gräf(f) (born around 1760 in Saxony, Germany), member of an early dutch - german bastard-branch of the Graeff family, possible descendant from Adriaan Jacobsz Graeff (hisself a bastard child of Jacob Jansz Graeff, born 1580 in Amsterdam).
The family now mostly lives in Netheraustria and Vienna.
* Helmuth Gräff (born 1958), academic painter and poet