Cognomen วอนใจ (วอนใจ 
, Vonjai 
, Quonjai) , around the globe, is a very rare surname. The last name วอนใจ is characteristic of South-eastern Asia, particularly Myanmar, where it is a very rare surname, and Thailand, where it is an extremely rare surname. Much less frequently, วอนใจ is the forename as well as the last name.