DH and I are talking about TTC DC2. We have a terrible time choosing baby names - used up the one boy name we could agree on for DS. We were discussing names again, and managed to find another boy name we both liked. However, DH's sister had always said that she would use this name for her son if she ever has one. She's had the name in mind since she was 14.
Obviously, this could resolve itself if:
SIL has a boy before us, and uses the name
SIL decides she's not having any more kids, in which case we're free to use it
We have a girl next time (we're only planning one more DC)
If neither of those things happen, I don't think we should use the name, at least without talking to SIL. I know I'd be upset if I'd had my heart set on a particular name for years, and then my SIL used it before I could (especially if she knew I planned to use it). There are plenty more names to choose from! DH says it doesn't matter that she likes the name, and we should use it if we want to. But he just doesn't get the idea that she might have been planning it for years!
I realise this is all hypothetical, but just wondering what anyone else would do?