Last name Changjai (Changjai 
) , in the world, is a rare cognomen. The last name Changjai is characteristic of South-eastern Asia, particularly Thailand, where it is a rare surname. Much less frequently, Changjai is the forename as well as the last name.
Anek, Jirachaya, Rungsinee, Pichitpon, Churairat, Amornthep, Voranuch, Nuntawan, Narubadin, Jurairat, Pawitporn, Auttapon, Amonthep, Supattra, Sasitorn, Monsicha, Nathutphong, Trairat, Roeng, Vilai, Santid, Kusorn, Rachan, Niyada, Nanthayot, Witoon, Banjerd, Kanjana, Poonnada, Rachata, Junticha, Jintana, Amonrat, and Boonyaporn