Trooper
Trooper Origin and Meaning
A surname-style word name, associated with the military in the UK, the police in the US, and more generally, with a supportive, dependable person who shows up without complaint. With the popularity of Cooper and with Truett and Tru rising up the ranks, sound wise, it fits current trends.
The word trooper derives from the French troupe, originally used to refer to someone who endures adversity, but adapted and borrowed over time to become associated with soldiers.
Military, police, and rank-related names might divide opinions, and Trooper has only been used on a small handful of boys each year in the US since the late 2000s.