I was booking my son into a art class at the local art centre. They went through the usual stuff, checking if we had booked before, taking my name and address, they then asked for my sons name. I just gave his Christian name and then she paused and said, what's his surname? I laughed and said, "sorry, it's the same as mine, but I bet you cant assume nowadays?" She said that actually there are more kids booked in that don't have the same name as the parent calling than do. So I guess you are not alone!