Surname Tjy (Tjy 
) , around the world, is a very rare family name. The family name Tjy is habitual in Singapore, where it is a rare surname, Australia, where it is a very rare surname, and Malaysia, where it is an extremely rare surname. Not in comparison with a country's population, this name is the most popular in Singapore, Australia, and Thailand. Much less frequently, Tjy is the forename as well as the last name.