Family name สุทธิธนกุล (สุทธิธนกุล 
, Sutitanakul , Sutidhanakul ) , in the entire world, is a very rare surname. The surname สุทธิธนกุล is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Sutitanakul, Sutthanggul, สุทธิธนกุล, Sutidhanakul | Thailand |
Suthitanakul, Suthitankul, Sutthitanakun, Sutthithanakool, Sutthithanakun, and Suttitanakull