Cognomen Roac (Roac 
) , throughout the world, is a very rare family name. The last name Roac is habitual in Nicaragua, where it is a very rare surname, Spain, and Mexico, where it is an extremely rare surname. Not in comparison with a country's population, it most frequently occurs in China, Spain, and the United States.
| VARIANT | COUNTRY |
|---|---|
| Roac | Brazil, Spain, China, United States, Mexico |