Family name ไพลอย (Plei 
, ไพลอย 
, Phailoi ) , all over the world, is a very rare cognomen. The surname ไพลอย is habitual in Thailand, where it is a very rare surname, Germany, and Spain, where it is an extremely rare surname. Measured by absolute frequency, it most frequently occurs in Thailand, Germany, and India. Much less frequently, ไพลอย is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Plei | Spain, India, Italy, Germany, United States |
| Phailoi, ไพลอย | Thailand |