Family name พลชัย (พลชัย 
, Ponchai 
, Polchai ) , all over the world, is quite a rare cognomen. The cognomen พลชัย is characteristic of Thailand, where it is quite a rare surname, Pakistan, where it is an extremely rare surname, and the United States. Not in comparison with a country's population, it most frequently occurs in Thailand, Pakistan, and China. Likewise, พลชัย is the forename as well as the last name.