Last name Grittaya (Grittaya 
) , around the world, is an extremely rare cognomen. Much more frequently, Grittaya is the forename as well as the last name.
Utto, Madol, Pokam, Daewa, Sukhum, Choogul, Kayodom, Heiranwuttitana, Hieranwuttitana, Yotharos, and Kaewsrimalai