Baby name issues 🙄

Me, My grandma, grandpa, aunts and a few cousins all share the same middle name. It’s like a little tradition. Well my sister doesn’t have the same middle name as us. I am pregnant with my first. My sister just had a baby and said her next babies middle name will be the family middle name and that now when I have kids I can’t use that middle name since she is first. She was genuinely MAD that I told her I’d be using that middle name too. It’s literally MY middle name 🙄 I don’t see why we both can’t use it but am I being ridiculous for also wanting to use that middle name? It’s my middle name and I think it’s a cute tradition and ridiculous she’d be this upset and accuse me of “copying” her.