Baby name dilemma

So im pregnant with my second baby and we just found out its a girl. Im so excited because we already have a son. Anyway, we always agreed that we only wanted two kids so this will be our last. I have a close relationship with my MIL and do love her a lot but ever since she found out its a girl she keeps insisting that we name her after her mother, who neither my husband or I have even met!

We both dont love the name and it’s just not going to happen. We told her we have a name already picked out and she took it so personally and kept saying that since we are not planning on another baby this is her family’s last chance 🙄 my MIL has 4 sisters and they have 9 granddaughters none of them named after their great grandmother! She’s making me so miserable and I don’t want to create tension between us over a name. Any advice?

P.s. my husband has one brother who also has a son and his wife is not close at all to her that’s why she’s pushing this on us.