So far, the small data base of YDNA test results don't appear to support that the MacKay, MacKey and McKee etc share ancient ancestry.However, the science is still evolving from what I can figure out.I'm sure others could post here to help us out with information that is the current theory. Also, when the data base is much larger kinship may be apparent from the results.
There seems to be support for McKee name origin in Scotland but the generally accepted thought seems to be from the Lowlands rather than the Highlands. And even across the border into northern areas of Britain.There is a web link I have recently added to my favorites which shows that the majority of McKee were from an area north of Glasgow and Glasgow area itself.The time period covered escapes me just now, perhaps about 1880 time frame.I will have to go back and post the link and the exact name of the "district" across a bay and north of where Glasgow area is shown on the map.
It seems to be accepted as fact that there was constant back and forth between Scotland and Ireland between generations of many of the same families depending on the politics or who won the most recent conflict.
If you go to familytreedna.com and click PROJECTS and on that page scroll down to YDNA SURNAME PROJECTS and down to letter "M" and further down page click on MCKEE.On the McKee page then click link to MCKEE DNA PROJECT. When on that page click on the left side of page on Y-DNA RESULTS. The YDNA test results show results for MacKey, Mackie, McKee, Kee, Kies, etc.Though the group is still small the first 12 of 67 test markers across the top of the page help the Project Administrator to group results for possible kinship.
If you go back to the "M" above and go to the MACKAY DNA PROJECT page you will see a much larger group of men having taken the YDNA test and how their results compare one to another.Some are in both groups.When you are related the results sort of "jump out" and the closeness of the markers to one another is easy to see if you study results across the list and compare one to another.
I am very much a beginner in the study of DNA w/genealogy and the above are only my thoughts from the intense study and the amount of time I have invested in educating myself on the DNA/genealogy.I certainly welcome any further education here.
From your message:MCKEE'S/M'KIE'S ETC IN PENNINGHAME, NEWTOWNSTEWART, SCOTLAND...............................
My response:....It would be great if you would share some of those records from Scotland with us here.If you prefer not here let me know and I'll email you.Also, the info from the monument at Killaney Church.Also, the location.I think you and I and Frank McKee emailed about that years ago but having two computers between now and then I cannot locate same and your posting history only shows this current post.It would be great to communicate with you again.Linda McKee