Baby name dilemma!

I’m pregnant with my second and have decided on the name Elijah for a boy and Eliyah (pronounced: Eli-a) for a girl. I’m 16 weeks and have always said these were “the names” even before I was pregnant. My sister in law, is about 6 weeks pregnant now and has decided on the name “Eli” for either a boy or a girl, despite being fully aware of myself and her brothers decision to have an Eli-based name and use Eli as the nickname for the bump and baby regardless of gender. My husband things IM BEING PETTY. And it’s taking me all my strength not to blow my top and my husband and his sister. He said his sister “takes pride in being original”. This is the woman who announced her pregnancy as I went in for an emergency section, who bought a cat identical to ours and named it after my profession and can’t see ish in my eyes (even on a petty level, steals IG story posts and stuff, just childish). I have a birth mark on my forehead so have always had a fringe/bags for as long as I can remember, I got teased about it a lot but within the family it’s a joke and “my thing”, I don’t own the hairstyle but it’s just a thing in my family and with my in-laws. So of course, she cuts herself bangs and goes on a ramble online about how original she is and I’m just in my head like... “??? Weren’t we all joking last week about how I’m the queen of the nerds and queen of bangs? Now it makes you original?”. I know it’s childish but it’s taken me a long time to own the fact that I’m more comfortable with my hair cut this way and get the point I can take teasing and turn it into a joke and my family all know this and have helped.

I’m deviated my husband doesn’t “get it” and thinks I’m in the wrong.... he thinks the cousins can both be called Eli.

Is this a woman thing? Am I being out of line? I have such a personal and deep connection to the name Elijah/Eliyah/Eli, I feel like she’s stolen from me and tainted something beautifully personally to my husband and I.