The name Trey is a boy's name of English origin meaning "three". Trey is ranked #564 on our popularity charts and is often added to lists like Boy Names Dads Like More Than Moms and discussed in our forums with posts like "Boys Makeover- Two Middles".
From the experts:
Originally a nickname for a third-generation son, as in Thurman Thackeray III, Trey is now being given to others, and it has also expanded to Treynor and Treyton.
The name also is popular among basketball fans: It's another word for a three-point shot.