Last name พหลรัตน์ (พหลรัตน์ 
) , around the globe, is a very rare cognomen. The cognomen พหลรัตน์ is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. Much less frequently, พหลรัตน์ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| พหลรัตน์ | Thailand |