Last name Трой (Troy 
, Treu 
, Трой 
) , worldwide, is a common surname. The surname Трой is habitual in Jersey, where it is quite a common surname, Ireland, and Austria, where it is quite a rare surname. In absolute terms, the name is most common in the United States, Germany, and Indonesia. More prevalently, Трой is the forename as well as the last name.