Tatar is the name of the general region north of the levant up through/past the Black/Caspian sea and into Russia. It can, at various points of history, refer to peoples and areas in that overall area.

I used to associate with a bunch of serbian pigs who one of them was banging this russian girl who was a little asian-looking and asian-acting (from saint petersburg) as "tataritsa". It's an insult to refer to a russian this way as Tatar usually is understood to mean the "savages" of southern and central russia. They are often possessing a lot of mongolian genes.

I saw on that link "Kazan Tatar". I'm not sure that refers to a tribe or people, because Kazan is a common word in the region for a cauldron or kettle type cooking device, resembles a Wok but usually a little more vertical at the edge, and very good for efficient deep frying.