Last name Troj (Трой 
, Troj 
, تروج) , around the world, is a rare cognomen. The cognomen Troj is characteristic of Sudan, where it is a rare surname, Kazakhstan, where it is a very rare surname, and Kyrgyzstan. Not in comparison with a country's population, it is commonest in Sudan, Kazakhstan, and Russia. Very seldom, Troj is the forename as well as the last name.