Board Thread:Theories and Speculation/@comment-32457608-20170823143115/@comment-734582-20170825153206

Naruto has Tomoe on his collar, yet that doesn't make him an Uchiha. Izuna has a circle in his MS design, that doesn't make him a Haruno. The Rasengan is a spiral, yet it wasn't even made by an Uzumaki.

It's just that Kishimoto likes certain symbols a lot, like circles and tomoe. It's nothing more complicated than that.