Hi I have some info, but not all jointed together.So I will do it over a few postings so as not to over load the picture allowance!First I will show the oldest grave of this family group in Donacavey ,the reason for this is to try and explain where they came from?This is very much up in the air ,but the O Cairney seems to come from the Donegal area and points to Derry (this is only speculation)
This is a reply to my own speculation,maybe with more questions than answers!The MC Carney name and all variants of the spelling,have multiple origins.Possibly five different beginnings or tribal origins.The names meaning being,victorious.The name in the northwest area of Derry /Inishowen is most likely descended from the Northern O Neill with close links to St Colmcille and the Fox surname.This groups most likely Y DNA group should be showing as a sub R1b know as R-M222?
The next group (which is more probable for me)as yet unfollowed up.This group is a sub group of the O Hanlon family group,who are part of a larger family group or tribe of people's who cover a very large area of southern Ulster and are collectively know as Oriel ( Airgíalla) again an R1b group,but not descended directly from the O Neill linage but related to it.After checking the Y DNA of family's of this group,most bearing Oriel names ,McGuire,O,Hanlon,Devine,MC Carneyetc ,etc return the bulk of individuals show R-M269, some references to the null 425?
There is a family group in Letrim and I tried to find their Y DNA group but with no luck.
The Lenister family group who are very likely again of O Neill Origin?
Some reading for anyone following very early family lines with the use of the Y marker,I would like to hear any ones views .Again this is all guess work and speculation ,but makes very interesting reading,once you get an understanding of the group and tribal areas?
http://www.mcmahonsofmonaghan.org/the_mcmahon_story.htmlhttp://magoo.com/hugh/airghialla.html#collahttps://en.m.wikipedia.org/wiki/Airg%C3%ADallahttp://homepages.rootsweb.ancestry.com/~amaguire/oriel.htmhttps://www.igenea.com/en/surname-projects/c/clan-colla-425-null-699