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Family name Ruđer (Ruđer ) , around the world, is an extremely rare cognomen. Predominantly, Ruđer is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Ruđer | Croatia |
Anić, Brkić, Sušanj, Dimnjaković, Novak-Mikulić, Mihovilić, and Friganović