Last name Piromnam (Piromnam 
) , all around the world, is a very rare cognomen. The cognomen Piromnam is habitual in Thailand, where it is a very rare surname, Canada, where it is an extremely rare surname, and the United States. Not in comparison with a country's population, the name is most common in China, Thailand, and the United States.
| VARIANT | COUNTRY |
|---|---|
| Piromnam | Canada, Thailand, Brazil, United States, China |