Because the Thirds hokage gave Naruto his mother's surname ( which is Uzumaki ) in order to protect him or so people wouldn't know he was related to Minato ( 4th hokage ).
One or the other, maybe both....Who gives a **** ?
rihari had said it already.. in order to protect naruto from the enemies of minato (since he was regarded as one of the best shinobi) he had given him the surname of kushina..
Kishi purposefully did this to confuse you.....!!!
Hmm., itz also a gud reason.Im pretty sure kushina and minato werent married yet. Cause if that's the case Naruto would have his mom's surname
The 3rd Hokage gave to Naruto his mother's surname because the people of Konoha would think that Naruto with his Nine tails killed Minato. And also to protect Naruto from Minato's enemies like the others said.![]()