This is why I insisted to DH that DS has the name I have loved all my life. I did NOT want to regret the name we picked if it wasn't the one I wanted. I know very well DH wouldn't regret anything, he's a male and the child grows into a name and he'd be happy with anything, but for me, a name is soooo important (i've been obsessed with baby names for as long as I can remember). I adore all my three kids names and that's because I was lucky and chose them all and they were all names that were very special to me.
However if I did want to change a name, I'd use middle name or just make one up, but wouldn't change it legally.
I have an old friend who still doesn't like the name she gave her son, 6 years later. She never changed it but always goes on about it. dont' think that's very nice for the son..