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