Surname จันทร์รัตน์ (Jantarat 
, จันทร์รัตน์ , Chantarat 
) , all around the world, is quite a common cognomen. The cognomen จันทร์รัตน์ is habitual in Thailand, where it is quite a rare surname, and the United States, where it is an extremely rare surname. Much less frequently, จันทร์รัตน์ is the forename as well as the last name.