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