I would just forget everyone else and use your dream name. I'd still use my dream name even if my cousin had used it this year for her 2nd DD. Not that I think she had it in mind, but you never know!
Anyway, who's to say that your sis doesn't have 2/3/4 boys and never gets to use the name! Go for it and don't worry too much.
Crikey, when I think of the names I adored when I was that age....!!!! :giggle:

