What is Beorn?

[Legolas]

Elladan and Elrohir did not have children, if they did, it was at least until after the arrival of Beorn.

I think you mean Elladan and Elrohir did not have children, at least until after the death of Beorn. He died before the War of the Ring.

Beorn has no known descendants

Sure he does. His son was Grimbeorn the Old.

This has also been discussed before on different threads, including one devoted to a theory that he was related to Radagast.

I wrote an article for the Barrow-downs FAQ, complete with forum links. You can read it here until it's loaded on to the main site.

[ January 29, 2003: Message edited by: Legolas ]