Det här är vad Encyclopedia of Arda skriver om Beorn:
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Dates: Thrived around III 2941; died some time before III 30181
Race: Men2
Culture: Founder of the Beornings
Meaning: 'warrior' and 'bear'3
BEORN
Grimbeorn the Old
The skin-changer who dwelt in the Vales of Anduin near the western eaves of Mirkwood, who could take the form of a Man or a huge black bear. He played a great part in the victory over the Goblins at the Battle of Five Armies.
Notes
1 Tolkien makes it clear in his letters that Beorn's lifespan was no greater than that of an ordinary Man. It's very unlikely, then, that he survived much beyond III 3000. (see The Letters of J.R.R. Tolkien No 144, dated 1954).
2 In the same letter referred to in Note 1, Tolkien explains that despite his remarkable abilities, Beorn definitely belonged to the race of Men: 'Though a skin-changer and no doubt a bit of a magician, Beorn was a Man'.
3 The etymology of Beorn's name is interesting. The Old English word originally meant 'bear', but evolved over the centuries to the point where it came to mean 'warrior'. So, Beorn's ability to transform from a bear to a man echoes the linguistic development of his name.
The original meaning of Beorn relates to the bear's love of honey, and contains béo, meaning 'bee'. This also appears in the name Beowulf: like Beorn, this means 'bear', but is literally 'bee-wolf'. This bee connection explains the references in The Hobbit to Beorn's bee-pastures and huge bees: 'The drones were bigger than your thumb, a good deal, and the bands of yellow on their deep black bodies shone like fiery gold' (The Hobbit 7, Queer Lodgings).