Family name Phachiyanukul (Phachiyanukul 
) , across the world, is a very rare last name. The cognomen Phachiyanukul is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Phachiyanukul | Thailand |
Ratita, Methaphum, and Kriangkrai