Family name Rittigrai (Rittigrai 
) , in the world, is an extremely rare surname. The surname Rittigrai is characteristic of South-eastern Asia, particularly Thailand, where it is an extremely rare surname. Much more frequently, Rittigrai is the forename as well as the last name.
Ounpan, Nobnorb, Ngamchum, Hemtanon, Rittidech, Tullawantana, Hamtanont, Hemtanont, Kittisuktapon, Ngaejaroenkul, and Siriboonphukdee