Yes it is. Funnily enough when my great-grandfather emigrated to Scotland the authorities changed his name to Shevlin. We always assumed Shevlane was somehow the more true form, but it's clear that both co-existed for a long time before and after. I don't know the origin, that's my question above and beyond what I can establish using records.
Interesting about Burkes, Elizabeth de Burgh was wife to King Robert the Bruce, and their origin explains status they had in Middle Ages era. I suppose the Anglo-Irish relations, exemplified by these folk, were far more positive before King Henry II did his thing.
Nice info about the respective Saints who might have travelled this area. Must take a look at that folklore collection.
In Scottish Islands and Highlands folklore and "second-sight" are still current phenomena. I wonder if there are many Belmullet tales of this kind? Is it still a thing over there?