Last name ตรัง (Trang 
, Tranh 
, ตรัง 
) , in the world, is a widespread surname. The family name ตรัง is characteristic of Vietnam, where it is a common surname, Macao, where it is quite a common surname, and Malaysia, where it is quite a rare surname. Measured by absolute frequency, the name is most common in Vietnam, Malaysia, and the United States. Much less frequently, ตรัง is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Trang | Malaysia, Australia, United States, Japan, Vietnam |
| Tranh | Malaysia, Australia, Canada, United States, Vietnam |
| ตรัง | Thailand |
| Tranga | Moldova, Thailand, India, United States, Democratic Republic of the Congo |
ชูเวทย์, ศรีศิลป์, and สุวรรณศิลป์