Family name เพียร์ซ (Phia 
, เพียร์ซ 
) , in all the world, is a rare cognomen. The family name เพียร์ซ is habitual in Botswana, where it is quite a rare surname, Myanmar, where it is a rare surname, and Singapore. Not in comparison with a country's population, it is commonest in Indonesia, Myanmar, and Morocco. Also, เพียร์ซ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Phia | Indonesia, Philippines, Laos, United States, Myanmar |
| เพียร์ซ | Thailand |