Surname สินศักดิ์ (สินศักดิ์ 
, Sinsak 
) , all around the world, is a rare last name. The last name สินศักดิ์ is characteristic of Thailand, where it is a rare surname, the United States, where it is an extremely rare surname, and India. Also, สินศักดิ์ is the forename as well as the last name.