Trey is my constant name no matter what if its a boy the second middle name will be Trey for two reasons.
1. My first son's 2nd middle name is Ron after his father so Trey will be in honor of myself.
2. My son wants to name the baby three and Trey means three so he wins!
I think Killian in the international context is much more serious than those who name it after the alcohol. Since my son is named so for the german heritage as well as the irish and is only K because while I much preferred the C the pronunciation in the US would have been a butcher's field day.