A nickname for those who are the third of their name. For example, this is William Henry Gates III's nickname within his family. Most of those persons listed here are named Trey for this reason.

Standard Anglo-American playing cards of rank three, as in "the trey of hearts" (3♥)

Trey Parker, creator of South Park

Trey Anastasio, an American guitarist, composer and singer, lead guitarist of Phish

Trey, a nickname used in basketball to express a three point field goal

Trey Songz, an R&B singer

Trey Gunn, a member of the band King Crimson

Trey of Triforia, a character in Power Rangers: Zeo

Trey Spruance, an American musician

Trey Wingo, an American sportscaster

Trey Teague, an American football player

Trey Junkin, a former American football player

Trey Azagthoth, a guitarist for death metal band Morbid Angel

Trey, Vaud, a commune in Vaud, Switzerland

Trey Smith, son of actor and singer Will Smith.