Surname Tranngoc (Tranngoc 
) , throughout the world, is a rare last name. The family name Tranngoc is habitual in Vietnam, where it is a rare surname, and the United States, where it is an extremely rare surname. Likewise, Tranngoc is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Tranngoc | Vietnam, China, United States |