I would suggest looking up his dam and sire's names, and make is show name in be cohesive with his lines.
If you can't find his lines, you should also consider thinking of names to do with his registered name.
Heres a few I thought of;
Midnight Water (since he's a dark bay, I thought Midnight fit ;])
H2O (pronounced H Two Oh) (ocean aka water aka H2O)
I tried to keep with the ocean/water feel :)
For Hunters, its appropriate to have a "elegant" or classy name.
Hope this helps! :)
Here are some of my favourites!
Take It Up A Noch
Catch Me If ya can!
Raise It Up
Too Cool For School
The Cheeky Boy
Diamond in disguese