Sister stole my baby name

No one owns a name.

You can still use it.

Or use as a middle name.

YABU

What’s childish about it? If we agree that no-one owns a name then both sisters are equally entitled to use it. If the sister genuinely wants the name she’ll keep it too. There’s no reason why cousins can’t have the same name. If it’s a power move she’ll drop it when she realises that OP isn’t going to fold.

No one owns a name so technically your sister has done nothing wrong however I totally understand why you are upset.

You can still use the same name. My Grandmother used a shorten version of her name. Two of my cousin share the name. Both siblings loved it and wanted to use it.

This is precisely why I chose names that aren't family names, that are ones I've taken the time to chose. Because that way nobody gets upset.
I get it's nice to honour relatives but actually they are their own little person, they are not someone else and that shouldnt be put on them because theirs an expectation they become as great as the person they are named after. Chose a name you love and your Dad will love it regardless because it's the name of his grandchild.

We have two Charlie's in our family. No one gave a shiny flamingo about it.

You don't own the name and have exclusive rights to it.

Use the name you want and don't stress!

It’s the name of a woman who is the Nana of both women.

Exactly this. The first one of them to happen to have a girl should be able to use it. The older sister probably loves it just as much if she chose it for her dd.

But why did you get it?

I don’t get the ‘dibs’ thing. It’s the name of a woman who is the Nana of both women. I don’t get how one person saying ‘I claim it for my child only. She might have been you Nana as well but it’s my name’

That's such childish behaviour imo.

Just choose another name - there are literally thousands of lovely girls names.

Is your Nana also her Nana?

This. If it is then of course she may also want to name her dd after her.

Please use a different name - your dd deserves her own name!!

I’ve just seen an excellent suggestion from someone on your AIBU thread. Call her bluff. Start talking about how special it will be for the cousins to have the same name. Once she knows you aren’t backing down and you have convinced her that you aren’t upset (this will take some acting) she is very likely to reconsider. The baby isn’t legally named until registered so you have some time.

Could you create an hyphenated name, by adding '‐two' ?

Anyone saying you don’t have dibs on a name I don’t get.
i named my daughter after my nana. Always said I would. And my sister knew that. If she had taken it I would have been fuming!
it’s about being kind to one another and doing that should no respect for you

We had the same thing happen. Sister had a different name chosen all along and we found out they decided to use the name we had chosen the day of the birth when she posted on social media.

We used the name anyway (also a family name)

It really hasn't made any difference having two cousins with the same name.

I have 3 sets of cousins with the same names, so my grandparents have multiple grandchildren with the same names. Unimaginative, but not impossible.

All the people saying you don’t own the name etc are technically correct, but it’s a dick move on your sisters behalf when she knew you had your heart set on it.

Why have you posted twice about this?

Just name her the same name. You like the name and it has sentimental meaning. You are naming your baby after your nana, not her cousin.
Would your nana have minded having two granddaughters named after her? Unlikely. If it’s a namesake then no one can get pissed off at anyone. That’s just the way it is.
Are their middle names and surnames different? I assume at least one is, so it’s not the same name anyway.

Nobody can steal a name.

I understand your point of view. Yes it’s a family name and she can use it if she likes, however, it sounds like you actively discussed how you felt. She had an opportunity to come to compromise, and instead, she was just dismissive.

In the same fashion in which she has used the name, you can go ahead and use it too.

Is your Nana also her Nana?

If so, why would you get dibs on naming your child after her?

Surely she using it to pay homage to her grandmother? Why does it matter so long as one of you use the name. She's used it.

Tbh I was named after a relative and think it's a silly practice in this day and age anyway. Children should have their own first name because they are individual human beings, not extentions of their parents and grandparents. Or pawns to use to garner favor.

Exercise some creativity and choose a new name. You haven't even met your daughter yet, she might not look like she suits the name.

Unless you think she's done it deliberately to spite you, in which case, cut her out of your life and move on. Life's too short already to sleep with snakes.

What is the name, Op?

It’s annoying, but it’s her granny too.

No one owns a name etc - and if you want to use it too, do.

Yep. I'd be angry too.
It seems wrong for so many reasons

1. unless she had three sons before, why hasn't she used the name already if it meant so much?
2. she knows it's your pfb and you had your heart set on it. What kind of sister is she?
3. your parents haven't supported you. No one, including BIL, has said, "Hang on a minute, isn't Jess calling her daughter that?

I totally get why you’re annoyed, especially as you’d had your heart set on that name for so long. Maybe it’s meant to be though and you’ll find the perfect name that’s even better and still gives a link to your family. If you tell us the name we can try to help?