Family name พิ (Phi 
, พิ 
) , throughout the world, is a common last name. The family name พิ is characteristic of Brunei, where it is quite a common surname, Vietnam, where it is quite a rare surname, and Macao. Measured by absolute frequency, it most frequently occurs in South-eastern Asia, particularly Vietnam, Myanmar, and Indonesia. Likewise, พิ is the forename as well as the last name.