Judging by the latitudes, the Flan who are nicknamed the Rovers of the Hunting Lands, correspond the Indigenous Canadian Cree, specifically the many groups of Central Cree.
In the plains, Wegwiur seem to correspond Niitsitapi (Blackfoot Confederation) a historic alliance various tribes including Siksika (Blackfoot). They are known for their values of egalitarianism and equal opportunity.
Chakyik might correspond Dane-zaa (also called Beaver exonymically) or a related wider linguistic grouping.
The exyonymic names often derive from a name that one tribe uses to refer to an other tribe, such as Dane-zaa "Real People", being understood elsewhere as if Dunne-za "dwellers among beavers", whence the English name Beaver.
When creating a fantasy name for a reallife culture, it is important the name feels comfortably endonymic to persons from that culture. I feel all of these names need to be doublechecked with sensitivity consultants.
Note, the 2024 versions of Chakyik and Wegwiur feel indigenous to Canada. The leaders of these groups lack the titles "khan" and "tarkhan" of Mongolia. Chakyik have "Lord" as a prominent title (possibly understood as a head of a prominent household, whence a chief). A prominent title among the Wegwiur is "Wolf-Mother". References to horse culture, "steppes" and "hordes" fancifully apply to the Plains Indigenous who also developed horse culture, including Niitsitap (Blackfoot Confederation). The connection to the Baklunish Empire is literally "ancient" history. Likewise their migration into the plains/steppes is ancient. They share no cultural affinity with contemporary Zeif.
From the 2000 Living Greyhawk Gazetteer:
In the vast expanses of the Burneal Forest, the Flan called Uirtag correspond the Indigenous Canadian Dene, especially Denésoliné (also called Chipewyan exonymically), as well as woodland Cree.
The Indigenous who associate the Black Ice are called Guryik, resembling reallife Inuit and known for dog sleds. The Guryik are said to originate from Baklun, namely somewhere in fantasy Asia. However this is an ancient migration.
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