Family name ตนใจ (ตนใจ 
) , all around the world, is an extremely rare last name. The last name ตนใจ is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname. Likewise, ตนใจ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| ตนใจ | Thailand |