Board Thread:Naruto Discussions/@comment-945885-20140709082448/@comment-2039297-20140719002903

Jashin Uchiha wrote: Since red hair is a trait of the Uzumaki clan, its safe to say everyone with red hair has an Uzumaki in their family tree somewhere.

That is both silly and fallacious. Red hair is an oft-held trait by Uzumaki's, but it doesn't entail being an Uzumaki (or being descended from one) if someone in the series has it.