This may be a little off topic, but I've had an idea buzzing around my head for a while. I'll bet that the Fourth's TRUE last name is Uzumaki. I'll bet that the Uzumaki clan was either in trouble/hunted by/sought after by other ninja from other villages. I'll be that he changed his name to Kazama for some reason or another, and had to use his real name on the summoning scroll. And, since the Uzumaki name seems to have fallen into the background, Naruto was able to carry it without being in danger. It may be a little odd, but I like the idea. I hope it's true!
hi im new here but thats not the point, i have a little thing to add mabe the fourth's wife had the last name of kazama so he took that chance to use her name so he would not get caught.