Cognomen 惟忠 (惟忠 
) , worldwide, is a very rare surname. The last name 惟忠 is habitual in Eastern Asia, particularly China, where it is an extremely rare surname. More prevalently, 惟忠 is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| 惟忠 | China |
| 阿蘇 惟忠 (b. 1415) |
|