I sorta figgered you were from that neck of the woods Kronckew, since you're manning the CSA consulate over there

! Thank you for posting that tomahawk!! very nice!
I'm not too sure on the differences between Blackfeet and Blackfoot tribes by the name, and I know I came across its origin somewhere, but have to find it. It gets pretty complicated as there are variations in different regions as you note. My family is from the Dakotas and I always have hoped to validate the family lore that says we have Native American blood from a grandmother way back when, and I try to imagine which of the multitude of tribes she might have come from. The Sioux consisted of many tribal groups that comprised the nation or confederation, and I understand they had come largely from the east, yet covered regions as far west as nearly to Washington.
These tribes were of course always moving around, even before the government decided to help

so trying to be more exact in regional locations gets pretty complicated.
My brother in law is of both Cherokee and Apache ancestry from North Texas, and is very keen on the Cherokee regiment that fought for the South during the "War Between the States" (as I was always corrected while living in Nashville whenever I said 'Civil War').
The Native American culture, ancestry and history is one that has often been misunderstood, misrepresented and never really fully appreciated until fairly recent times. The more I learn on it, the more fascinated I become, and as I travel I cannot resist trying to see the historical locations as I come upon them.
All the best,
Jim