Cognomen สุเมธกุล (สุเมธกุล 
, Sumethkul , Sumetkakul ) , throughout the world, is a very rare family name. The cognomen สุเมธกุล is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname. Much less frequently, สุเมธกุล is the forename as well as the last name.