Family name เขาใหญ่ (Khaokai 
, เขาใหญ่, Khaeyai ) , across the world, is a very rare cognomen. The last name เขาใหญ่ is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname. Much less frequently, เขาใหญ่ is the forename as well as the last name.