Because we find out the sex of our babies we try to keep the chosen name a secret. I say Try because after a while I tend to start referring to the babu by the chosen name.
FWIW for our angel we had DD name chosen and told my mother and her exact comment was " Shae, thats a horses name not a name for a baby, you don't want to name her after a horse"
SO we chose another name for our angel. then when we were pregnant with DD, Dh said this baby's name will be Shae and that was it .... now Mum reckons its such a beautiful name, go figure ...

At the end of the day, if your not going to be influenced by others opinions then I don't see any reason why telling other what you like ITMS unless of course you want to keep SOMETHING a secret. I am not worried about others using my names as I don't have that many "close friends" whom are TTC that like the same sorts of names.

BTW I love both the names Romone and Diego