Family name Kreingsak (Kreingsak 
) , across the world, is an extremely rare surname. Much more prevalently, Kreingsak is the forename as well as the last name.
Wankul, Khunraksapol, Veeraprame, Rattanakul, Sirikatitum, Lohatantiworakul, Puttapong, Pornpanawan, Damrongsaksiri, Kaewvirul, Tekunatorn, Dhamrikarn, Rawiwong, Wongmek, Phuamorn, Kuresri, Somboon, Sanorsamnieng, and Dumrongsaksiri