Last name สิทธิเศรษฐ์ (สิทธิเศรษฐ์ 
, Sittiset ) , across the world, is a very rare surname. The surname สิทธิเศรษฐ์ is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. Likewise, สิทธิเศรษฐ์ is the forename as well as the last name.