Family name พญาไท (Phaothai 
, พญาไท , Phaechai ) , across the world, is a very rare last name. The cognomen พญาไท is characteristic of Thailand, where it is a very rare surname, Canada, where it is an extremely rare surname, and the United States. Also, พญาไท is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Phaothai | Canada, United States, Thailand |
| พญาไท, Phayakhaphiban, Phaechai | Thailand |
Phachanathong, Phachanya, Phachya, Phadya, Phaechaiyaphum, Phaengya, Phaichayont, Phaimonthai, Phaithai, Phaiya, Phaiyarath, Phaiyasan, Phakaidao, Phakhichai, Phaochai, Phaphai, Pharichai, Phathai, Phathaya, Phatichaya, Phatkhai, Phatya, Phatyaphan, Phayaban, Phayachai, Phayakapong, Phayakchan, Phayakhaem, Phayakhruea, Phayakkasem, Phayakkhawisai, Phayakorn, Phayakrat, Phayakreungthong, Phayakruengtong, Phayaksa, Phayaksiri, Phayaksorn, Phayakyuth, Phayamongkhon, Phayapantong, Phayaprom, Phayarat, Phayarattanare, Phayatham, Phayatnitivong, Phayattrakul, Phayavong, Phayawang, Phayawet, Phayawong, Phaymuanghung, Phayomyont, Phaytai, Phayuhasena, Phayungmalai, Phayungsri, Phayungsuk, Phayupat, Phayuphon, Phethai, Phratchaya, Phyachat, and Phyathai