If you want some good sounding names associated with Custer I could suggest a few:
From little big horn;
Marcus Reno: great name, unfortunately the guy lost his head in the heat of the battle, lead a really bad retreat.
Frederick Benteen: basically took over command from Reno, was calm and competent.
Luther Hare:2nd in charge of the scouts
Fictional characters worth mentioning;
Jack Crabb: protagonist of "little big man", one of Custer's scouts, was dismissed when he told Custer he'd lose the battle.
Harry Flashman: Pathiological liar and coward featuring in George McDonald Fraser's "Flashman" series.
A few names with historic context. Personally I'd be tempted to avoid Custer himself, the guy was as Aidan described an arrogant fool. That said there are some good names out there and I'd definitely go for a 'western' theme as it fit's his appearance so well.
Finally great model, looking froward to more about him