I'm so sorry to hear this, Marie. I haven't been in this situation myself, but I remember dating a handful of guys that were bad news. Unfortunately, when my parents directly confronted me about it, I withdrew from them. That's not to say your daughter will do the same. We're all different. But if she thinks she's in love with him, then it's a precarious situation.
Did you say anything when her boyfriend called her names in front of you? I think, if it were me, I would probably try to make that an opening. It could be the wrong move, but maybe try calling him out when something happens around you. It might embarrass her or make her angry, but it plants a seed that his behavior is inappropriate.
Now I'm imagining all of the ways that could go wrong but, unfortunately, I don't think there's anything you can do that would guarantee a positive outcome. Are you very close with your daughter? Has she opened up to you about him or her relationship?