Cognomen ศิริเดช (ศิริเดช 
, Siridech 
, Siridet ) , throughout the world, is a rare family name. The cognomen ศิริเดช is characteristic of Thailand, where it is a rare surname, Philippines, where it is an extremely rare surname, and the United States. Likewise, ศิริเดช is the forename as well as the last name.