Names....(I'm unhappy)

For the last week or so the name we've been calling the baby just doesn't feel right! We had the 3-D sono, done and he just doesn't look like a David to me... I'd feel bad for changing it now because we are using family names and I don't want people to be hurt we decided to not use them, but idk... It just doesn't FEEL like his name... My husband will call the baby David, and it's like I have no idea who he's talking about and I'm referring to him as the baby...