Surname เศรษฐจักร (เศรษฐจักร 
, Sethajak, Settajak ) , in all the world, is an extremely rare last name. The family name เศรษฐจักร is characteristic of South-eastern Asia, particularly Thailand, where it is an extremely rare surname. More frequently, เศรษฐจักร is the forename as well as the last name.