Cognomen เรือนใจ (เรือนใจ 
, Ruanjai 
, Rueanjai ) , around the globe, is a rare last name. The last name เรือนใจ is characteristic of South-eastern Asia, particularly Thailand, where it is a rare surname, and Malaysia, where it is an extremely rare surname. Also, เรือนใจ is the forename as well as the last name.