Worldwide, ประถมรัตน์ (ประถมรัตน์ 
) is a very rare mostly female, but seldom boy's first name. The given name ประถมรัตน์ is habitual in South-eastern Asia, particularly Thailand, where it is a very rare dominantly female, but seldom boy's name. Likewise, ประถมรัตน์ is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| ประถมรัตน์ | Thailand |