Cognomen ไชยรัตน์ (Chairat 
, ไชยรัตน์ , Chaiyarat 
) , in all the world, is a common surname. The family name ไชยรัตน์ is characteristic of Thailand, where it is quite a common surname, Tunisia, where it is quite a rare surname, and Laos. In absolute terms, it is the most numerous in Thailand, Indonesia, and Tunisia. Likewise, ไชยรัตน์ is the forename as well as the last name.