Family name Penpilai (Penpilai 
) , around the world, is an extremely rare cognomen. Much more frequently, Penpilai is the forename as well as the last name.
Suesat, Bunnak, Phunleng, Kasempin, Kerdporn, Pentisan, Thongdum, Kongsawat, Chanwarangkoon, Chaiyaphan, Rochanawongchai, Damrongporn, Nareepangsri, Suwansaenthawee, and Bhanthumnavin