I was mighty upset when my best friend called her daughter my favourite girl's name. We had been talking about names when she was pregnant and (maybe rather stupidly) I told her my favourite girl's name - x. I asked her (when she was still pregnant) a couple of times what names she liked and both times she refused to tell me. I thought that was a bit funny at the time.
Then 3 months later she had her daughter and when I went to see her in hospital (I am now her godmother) she said 'her name is x'. I was really hurt but didn't let on of course as she had just had this darling little girl.
However I did write her a letter a few weeks later to let her know that I felt hurt - not at the fact that she had no right to use that name (of course nobody owns a name) but that she was well aware it was my favourite name and went ahead and used it anyway. It would have been kinder if she had simply said to me, when I asked her what her favourite names were - do you mind if we use x name - I know you like it. Of course I would have said no problem.
Anyway, it all came out in the open, I told her it had hurt me, she said sorry, I am godmother to x and all is well. I have now had a daughter and had to use another name.....