I'm sure it's just me, Doug, but I'm still not convinced that the Earls of Ross, should have their LNAB changed to O'Beolan (or any variation). Perhaps because I work on the fringes of academia and want proof, or maybe I'm one of those adults who didn't grow out of saying "Why, but why ..."
I think the quote from Skene's, 'Celtic Scotland', (the original can be found here ), that "according to tradition, bore the name of O'Beollan" is pretty telling, in that there is no proof, it is only tradition.
Skene cites an article by Reeves "Saint Maelrubba: his History and Churches". (pp 258-96) on which can be viewed for free from Volume 3 at this site http://archaeologydataservice.ac.uk/archives/view/psas/volumes.cfm but again there is no direct link between the O'Beolan and Fearchar or Farquar the 1st Earl of Ross of this line. Again it is based on a "legendary history of the MacDonalds ... that this surname Obeolan was the surname of the Earls of Ross, till Farquhar,was created earl and so carried the name of Ross since", pages 275-276.
Interestingly the Chronicle of Melrose, which Reeves also quotes in the original Latin and English translation, never refers to the Earl of Ross, by the name O'Beollan.
Again that 'Why?" part of me really wants to question the statement from the macfarlanegenealogy website "That the O'Beolan Earls of Ross, of whom Ferquhard Mac an t'Sagairt was the first, descended from the same ancestor, Gilleoin na h' Airde, as the older "Gillandres" earl of 1160, is equally certain" I want to know, 'why is it equally certain?', 'what's the source for saying it's equally certain?', 'is that just a statement or is it based on anything?'. Unfortunately although the website does have some references, there are no citations, so I can't tell where that might have come from.
There are some more recent references in the 2 Wikipedia articles you mention, that might shed some more light on this issue, but because they are recent, they may be very difficult to find online. Even with those, I think there must still be some doubt that O'Beolan should be used as anything more than a possible 'Other Last Name' but that is just my opinion.