I've done that, well not using another name. Someone called for Serena and I raised my hand, LOL. Also, I was always the only Sabrina in my classes except for one time and well the other Sabrina's LN is before mine so when they called her we both raised our hands and looked at eachother like "what the...". LOL. I felt so embarrased.
I honestly don't see how someone get's Haven from Heaven they sound completely different, IMO.