As several educated guesses, I'd say their are maybe Two Hundred Thousand people in the world correct? So I'd say a unpopulated tribe would have less than five thousand, and a very light population would be 5-15 thousand people. Anyway here is the story
The reign of Eirc
If Ulexsander was a overshadowed king, Eric could be considered truely unremarkable. All he did was fallow his father and grandfather. He finished the spreading of clay pots and every village had some caribou has a food source, allowing greater growth across the nation. He also settled a few more islands. But what happened in Erics reign was far more important than Speaker Eric himself.
The first thing that happened is the fur became all the rage among the tribal leaders, shamans, great hunters, and well anybody who was anybody. Although these primitive fur garmets couldn't be called coats by todays standards, they did provide warmth against the chill morning air.
It was Wiseman Kyphros who came up with the idea. He spread out a two caribou furs left over from the making of the tents. Then he sowed, if you can call it that, the two furs together. The result was a body long garmet, complete with sleeves. He told the king and got his name carved beside Wiseman Huron's. Soon this practise became widespread and every caribou herder and hunter supplemented their household with these.
They also became sort of a currency. A big coat could get you two child size ones, or three days worth of fish. You could get three clay pots for a single coat, or one large pot. Two coats would get you a spear or a week's bread. You could even trade four for a whole tent!
The second thing that happened was that Wiseman Pannor made a survey of the Galavanians, starting with the islanders and heading in land. This is what he found:
Villages: 374
Island* villages: 65
Grand** villages:7 (Kylarn, Copenhagen, Forar, Snerk, Wabafee, Lupen and Beror)
Males: 3678
Females:4987
Children:1024
Caribou:10256
Warriors/Raiders:726
*Europe was considered an island
** Grand villages had populations of over 500
OOC: I know math hasn't been invented yet but, I'm just going to ignore that for the sake of the story

. Also that is why I was asking about population.