Bob,
MIC 6A/2 is a microfilm. You’ll need to get a researcher to got to PRONI to go through it for you. Researchers in the PRONI area: http://sgni.net
Or, PRONI themselves do simple looks ups (for a fairly hefty fee, in my opinion). So if you want a copy of a given baptism at a known church and an approximate date, they will likely do that, because it probably will only take 10 minutes to find. What they won’t do (as I understand it) is a trawling search where you have to go through a lot of records and it’s hard to know how long the research will take. You could e-mail them and ask if they’ll search the microfilm for you. If they agree, you pay in advance, regardless of results.
Regarding Quigg & McQuigg & McCouaig, they could certainly be the same name. (McQuide I am less certain about and MacLysaght doesn’t mention it). The Mc, Mac, M’ & O’ prefixes are all detachable and were dropped or attached at whim. It’s just a prefix, and only indicates that you were related to that person or family. It’s easy to find families in the 1901 & 1911 censuses who used a prefix one year and didn’t the other.
The idea of a single or correct spelling for a surname or a place name in Ireland is very much a recent phenomenon designed to meet the needs of modern officialdom. Before that there was no consistency. Names were spelled phonetically and each variation was down to the whim of the particular person recording the information. You will often see the spelling change as the records go back. This rarely indicates a deliberate decision to alter the name, nor even a mistake. Not everyone was literate, but even when they were, exact and consistent spelling simply wasn’t something they bothered about.
You also have the dimension that these are Anglicized renditions of a Gaelic name. And names in Gaelic change according to the grammatical context. Use of the genitive normally involves an extra “i” for example. So expect spelling to vary. That was the norm. (A common name on Rathlin today is McFaul. They originate in Scotland where it’s McPhail. It’s easy to see how you get from one to the other).
Your information that the family was Presbyterian is interesting. There’s no Presbyterian church on Rathlin and never has been. There’s an RC church and the Church of Ireland but no others. So when your ancestors moved to Rathlin did they change denomination? (It’s just about possible they occasionally attended the Presbyterian church in Ballycastle but that would have been difficult in winter months especially).
Looking at the 1901 census I see a McQuaig family on Rathlin who were Church of Ireland. They appear to have been the only protestant McQuaig (and variants) at that period.
http://www.census.nationalarchives.ie/pages/1901/Antrim/Rathlin/Corravindoon/922023/
I have certainly heard of an influx of new settlers in the 1700s or thereabouts. The Duke of Argyll’s Campbells reportedly slaughtered half the island’s population in the 1500s and I think again in the 1640s, and so new folk eventually arrived to replace them. Traditionally many came from Scotland. Speaking of Rathlin, Nils Holmer observed in 1942 that: “.. the population used to be fishermen and sailors and a considerable intermarriage with the mainland Irish and Scots may be expected. Thus of the nineteen persons listed as Irish speakers, three have mentioned Scottish parents or grandparents, three have supposed their ancestors came from Scotland, while the rest know of no other than their Irish. As for those who believe their ancestors were Scots, it must be remembered that there is a common theory in the island that every single family of those living there now are descended from Scots settlers who came to the island after the complete massacres of the sixteenth and seventeenth century. … Leaving the truth value of the historical evidence of a transplantation of the inhabitants aside, it still remains a fact that the connections with Scotland are important.”
Turner (p 124) also says: “ It should be clear from any observation of the Glens that the Scottish connection with Ulster is much more complicated .. and while the majority of the population is Roman Catholic in religion, that the names of many of the old Protestant families in the Glens and Rathlin cannot be differentiated from their neighbours in type and origin. It is unwise in Irish family name study to attempt to make deductions based solely on the basis of a supposed correlation between religious denomination and any given family name.”
You may know that in 1617 a George Crawford of Lisnorris, Kintyre started a legal claim to Rathlin, stating it was Scottish and not Irish. Some accounts refer to snakes being released on Rathlin to help resolve the case (Scotland has snakes, Ireland doesn’t). The snakes died, ergo Rathlin was Irish.
Not sure how well you know the area but if not, I have attached a couple of photos which demonstrate the relative proximity. Both taken from near Carrick a Rede on the mainland. Picture 0002 is of the west end of Rathlin (the west lighthouse just peeking out) and Islay behind it. Pic 1998 is the rest of Rathlin, with the Kintyre peninsula behind. The modern ferry from Ballycastle to Port Ellen on Islay takes 1 hour. It would have been a bit slower in the days of sail but always a relatively easy journey.
Finally another of your possible ancestors built a very famous tower in Oban, known generally as McCaig’s folly. You might enjoy reading about him:
http://www.photographers-resource.co.uk/A_heritage/Monuments/LG/mccaigs_folly.htm