Last name Thja (Тхя 
, Thja, ธิจา 
) , around the world, is a very rare cognomen. The cognomen Thja is characteristic of Kyrgyzstan, where it is a rare surname, Kazakhstan, where it is a very rare surname, and Thailand. Measured by absolute frequency, it most frequently occurs in Kazakhstan, Russia, and Kyrgyzstan. Very seldom, Thja is the forename as well as the last name.