I sure hope he's not Gunner Duggar, because that would be six kinds of dumb.
Gunner's a dumb name anyway. Gunnar is too but at least it's an actual name and would probably pass unnoticed in Scandinavia or Germany.
Gunner is a position on a fighter jet or tank.
In high school we had to read a poem called "The Ball Turret Gunner" told from the perspective of a guy in the little bubble-shaped attachment under a plane in WWII. It was the most miserable and dangerous position on a warplane, and the poem ends with the gunner saying "they washed me out of the turret with a hose."
So no, it's not a name I like. Kind of like naming someone Sniper or Shooter.
Before you criticize a man, walk a mile in his shoes. That way, when you criticize him, you're a mile away and you have his shoes!
Steve Martin