Well, here is an example of a Canadian hockey player called
Trey:
https://www.eliteprospects.com/player/270016/trey-watson
And although
Trey obviously started in the USA and so far I don't know of examples born outside North
America, I would be surprised if there were absolutely no small boys named
Trey in other English-speaking countries because of the use of the name in shows like "Sex and the City" which I believe have some international exposure.