Last name รัตนมงคลกุล (รัตนมงคลกุล 
, Ratanamongkolkul, Rattanamongkul ) , in the entire world, is a very rare cognomen. The surname รัตนมงคลกุล is characteristic of South-eastern Asia, particularly Thailand, where it is a rare surname.
| VARIANT | COUNTRY |
|---|---|
| รัตนมงคลกุล, Rattanamongkul, Rattanamongkolgul | Thailand |
Rattanamongkolkul, Rattanamongkonkoon, Rattanamongkonkul, and Rattanamongkonkun