Family name เมตตาสิทธกร (เมตตาสิทธกร 
) , all around the world, is an extremely rare last name. The cognomen เมตตาสิทธกร is habitual in South-eastern Asia, particularly Thailand, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| เมตตาสิทธกร | Thailand |