Cognomen ประตูน้ำ (Pratoommat 
, Pratumthai , ประตูน้ำ) , across the world, is a very rare surname. The cognomen ประตูน้ำ is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname. Very seldom, ประตูน้ำ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Pratoommat, Pratumthai, Pratanrach | Thailand |
Gateaume, Gatemai, Narmgate, Pradutnam, Pratan, Prataun, Pratnam, Pratomnam, Pratomthong, Pratoomchai, Pratoomchat, Pratoommuang, Pratoomphet, Pratoomrat, Pratoomwee, Pratpoo, Pratuangtum, Pratuarn, Pratubat, Pratumkam, Pratumket, Pratumlai, Pratumnat, Pratumon, Pratumpab, Pratumpai, Pratumr, Pratumrach, Pratumsai, Pratumsee, Pratumtao, Pratumteep, Pratumvan, Pratumwam, Pratumwee, Pratumwon, Pratun, Pratunam, and Pratuong