Beornings?

[aramis]

Not bad, although it's not very useful until the last years of the Third Age and into the Fourth. Granted, we don't know whether or not Beorn sired more than one child.

As long as that child lived to breed, that's not a big issue...

The opposite, I would think. It is a much bigger deal if Grimbeorn becomes an uncle rather than being an only child.

Given that his brithyear is TA 1967... by the time of the hobbit, 1000 years have passed. Given a typical human generation time of 20-25 years... (SOme families as low as 16 to first child; others as high as 30 to first child are not uncommon).. Let's assume Beorn's get is 50 per generation for at least the first 5... and GB has 2, while his get have 3 survivors to breed each...

Assuming Grimbeorn is an only, but sires 2... at 50 and statistically normal 54... and 4 score liifespans... then 3 per child...

So we get a mental model of...
Several hundred within 300 years, and several thousand by a thousand years. If grimbeorn has a sibling who bears the gift... it merely doubles. by 21
So, gen 1 is 2017-2021, gives us 2
Gen 2 is 2067-2083, gives us 6 more
Gen 3 is 2117-2141, gives us 18 more
Gen 4 is 2167-2199, gives us 54 more, but loses us 2.
Gen 5 is 2217-2367, gives us 162 more, loses us 6.
Gen 6 is 2247-2415, gives us 486 more, loses us some dozen.

Now, that's a high end estimate, but if we get more than one survivor in more than one generation, we get lots bearing the bearform.

Yes, the puns are intentional.

It's entirely possible that half the beornings have a smidgeon of Beorn's bloodline.

[Otaku-sempai]

Given that his brithyear is TA 1967... by the time of the hobbit, 1000 years have passed. Given a typical human generation time of 20-25 years... (SOme families as low as 16 to first child; others as high as 30 to first child are not uncommon).. Let's assume Beorn's get is 50 per generation for at least the first 5... and GB has 2, while his get have 3 survivors to breed each...

Who was born in TA 1967? Even Beorn himself was unlikely to be anywhere near one thousand years old. Tolkien wrote in Letters:

Though a skin-changer and no doubt a bit of a magician, Beorn was a Man.

As far as we know, Beorn did not sire any children until well after the Battle of Five Armies. Certainly the Beornings did not exist as a people before this time and there seems to be no sign of Skin-changers among the local Woodmen and folk of the Anduin Vales. In the context of the Darkening of Mirkwood campaign Grimbeorn is born in the year 2969. If you are going by lotr.wikia, don't. That site is flat-out wrong!