New kid's last name

ahill1889

I am in the middle of a divorce, and am changing my name back to my maiden name after it's done.  My first kid has my ex-husband's last name.  Do I change her name and give my boy my last name, leave her name the same and give him my last name, or keep them both with his last name?  I'm struggling with this.  It doesn't help that the father is barely around, but keeps talking about how he wants to stay around and be here for the kids.  Any advice?  Anybody been in this situation?  Any help is appreciated.  TIA!!