Board Thread:Naruto Discussions/@comment-24731718-20180914031021/@comment-1872728-20180915063908

Nagato's mom has red hair only in the anime, so in the manga maybe his dad is from the Uzumaki. Also he never had the Uzumaki surname, but that could be because they never revealed it.

As for Naruto, because using Uzumaki is better than using Namikaze since Minato had enemies out there.