Cognomen กรมงคลพจน์ (กรมงคลพจน์ 
) , across the world, is an extremely rare family name. The last name กรมงคลพจน์ is habitual in South-eastern Asia, particularly Thailand, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| กรมงคลพจน์ | Thailand |