Every Monday we will post an entry that hasn't yet been published with a view towards harnessing the collective onomastic power of the internet. If you have any thoughts about the name's origin, other variants it might be related to, other examples of its use, etc., please share them in the comments! If you wish…
A strange-looking name, but a plausible answer in the comments. I think the -walh that's suggested as the 2nd element is related to the word that gives us Wales and walnuts, though I could be wrong.