Board Thread:Theories and Speculation/@comment-30355627-20161218164138/@comment-734582-20161218170216

It's just called a Rinnegan, because it's not a new or merged Dojutsu. This is emphasized by Naruto Gaiden.

So yea his left eye is just a Rinnegan and Sharingan in one eye, not a rinne sharingan or sharinnegan or whatever