Family name ไชยสิทธิ์ธีร (ไชยสิทธิ์ธีร 
) , in the world, is a very rare cognomen. The family name ไชยสิทธิ์ธีร is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| ไชยสิทธิ์ธีร | Thailand |