Ex is naming new daughter after your dead one

Yep you read that right. My ex fiancé is planning on naming his new daughter with his new girlfriend the same name as our daughter who we lost at 12 weeks back in 2018. His new baby is due in a couple weeks and they just announced the name, I’m assuming because he knew I would find out as we have mutual friends which is why they waited so long to tell everyone what her name was going to be. To say I’m angry and hurt is an understatement. If he goes through with this they won’t be able to find him. Can he even do that? Can I sue him? Loosing our daughter was very traumatic for me and is what ultimately lead to the end of our relationship because he couldn’t handle it. And now it feels like he is personally trying to hurt me in any way he can, he’s even brought up here recently that I have a “dried up uterus” and a bunch of other things about my health conditions and has harassed me to the point that I had to get a protection order and now this. Is there anything I can do to keep him from naming her the same name as our dead daughter? Or is it something I’m just going to have to accept and try to live with? I’m just so lost and so broken about this I miss my daughter more than anything in the world especially now that I’ve had four losses all together and still no rainbow. I just don’t know what to do please help.