According to Monty, team names should be evocative of a color, be it an actual color, a color in another language, or a visible thing that brings to mind a certain color.  When that's been impossible so far, we've gone with things that are at least visible/touchable.  'Regrets' would not be my first choice.

I took a quick look for more possibilities but none were good:
Ringlets (probably not all that good for a team with all male members)
Rutabagas (the vegetable.  Evocative of a brownish-purple color)

It might be worth considering given Robert's records and ability that Ozpin might reassign the team, making someone else (someone perhaps more fit for the position) the leader, and thereby opening up more naming possibilities.  Having the leadership given to someone else might provide an interesting direction to take Robert: he'd probably feel bad about it, but being free from the stress and responsibility might ultimately help restore his happier nature.