Cognomen 恒曜 (恒曜 
) , across the world, is a very rare last name. The surname 恒曜 is habitual in Eastern Asia, particularly China, where it is an extremely rare surname. More prevalently, 恒曜 is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| 恒曜 | China |