DH and I first discussed baby names about 12 years ago when kids were still a long way off for us and we decided on a boys name we liked then and we decided a girls name about 6 years ago. These obviously weren't set in stone and we never told anyone else what the names were.
2 years ago my sister had her 2nd son and named him Benjamin but he is always referred to as/ called Benji. Benjamin was going to be our name for a boy. My sister didn't know this and I didn't tell her this after she had him either but I did mention it to my mum when she told me he'd been born and the chosen name.
I am now pregnant and it's a boy and there is literally not one other name I can find that I like for boys, nevermind one that my DH would also like. DH has one other name he likes but I don't like it. It's quite unusual and I tend to prefer old-fashioned, traditional names. I have read websites full of lists of names and still there is nothing I can find!
Since Benji is Benji how unreasonable do you think it is to call my son Benjamin?
I see my sister and her family about 5 times a year but we are quite close and keep in touch regularly via social media along with our other sister and brother.
I don't think she'd be thrilled about me choosing the same name as her but I don't know if it would bother her that much especially if we call him Benjamin and never Benji.
It is not a particularly unusual or unpopular name, always in the top 50, so I wouldn't be bothered if a friend also used it but with it being my sister's child's name I do feel a bit like I am overstepping the line.