Last name สัจจวิทย์ (Sajjawit 
, Satjawit , สัจจวิทย์ ) , throughout the world, is a very rare surname. The family name สัจจวิทย์ is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname. Likewise, สัจจวิทย์ is the forename as well as the last name.