Last name สิทธิ์ไกร (สิทธิ์ไกร 
) , worldwide, is an extremely rare cognomen. The family name สิทธิ์ไกร is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. Very seldom, สิทธิ์ไกร is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| สิทธิ์ไกร | Thailand |