Cognomen Royama (Royama 
) , throughout the world, is quite a rare last name. The surname Royama is characteristic of Japan, where it is a rare surname, Canada, where it is an extremely rare surname, and Brazil. Not in comparison with a country's population, this name is the most popular in Japan, Brazil, and the United States.
| VARIANT | COUNTRY |
|---|---|
| Royama | Japan, Canada, Brazil, United States |
| t. royama botanist |
|