Family name สิทธิฤกษ์ (สิทธิฤกษ์ 
) , in the entire world, is a very rare surname. The surname สิทธิฤกษ์ is habitual in South-eastern Asia, particularly Thailand, where it is a rare surname. Much less frequently, สิทธิฤกษ์ is the forename as well as the last name.