Help with the translation of "Broadbeam"

[Glorelendil]

The English word 'beam' is derived from the German word for tree ('baum') and I suspect it originally meant that, before it was co-opted as a construction term. There's a type of tree called "hornbeam", and of course there's "Quickbeam" from LoTR.

[Falenthal]

So in short, the Broadbeams are probably characterised by their overall broad and squat built compared to the other tribes.

-a metaphor for a physical quality like a very broad shoulder set or a strong, wide back.

2) horizontal Structural element that bears heavy loads

This seems the way to go when looking for a word that keeps the original meaning. And also, knowing this meaning, I can add some flavour to the general appareance of those dwarves.
Thanks to all for your collaboration!

[Valarian]

I would imagine that the Broadbeam would indicate shoulder width rather than hip.

[Otaku-sempai]

I, too, would say that the Broadbeam Dwarves tend to be exceptionally stocky (or, at least, that that is what is implied by the name). Beam equals width.