Last name ทุ่งใหญ่ (Praongai 
, ทุ่งใหญ่, Tungyai ) , across the world, is a very rare cognomen. The family name ทุ่งใหญ่ is habitual in South-eastern Asia, particularly Thailand, where it is a rare surname. Very seldom, ทุ่งใหญ่ is the forename as well as the last name.