Keep in mind, re the name change, that firebird the database had been an open source project for quite a while when the mozilla folks grabbed it without checking to see if anyone else was already using it. the funny thing is, the other name for firebird was IBPhoenix, yet another name the mozilla folks managed to appropriate for a while.
But they really did check pretty hard with firefox, and other than being a plane and the title of Clint Eastwood's weaker movies, I don't think there's a lot to worry about. This name should stick.