Cognomen พรหมไตร (พรหมไตร 
, Promtrai 
) , around the globe, is a very rare surname. The surname พรหมไตร is habitual in New Zealand, where it is a very rare surname, and Thailand.
| VARIANT | COUNTRY |
|---|---|
| พรหมไตร | Thailand |
| Promtrai | New Zealand, Thailand |