The McCown surname is Mac Eoghain in Gaelic and on the Ulster Heritage DNA Results page (www.ulsterheritage.com) you will find a heading for Mac Eoghain---but not all McCowns are shown under that heading. The majority of the 25 tested have their results shown under that heading. Most of those are descended from Francis McCown, John McCown or George McCown who are all believed to descend from Alexamder McCown, a Presbyterian minister.
You will find two or three others listed under the haplogroup heading R1b1b2 or R1b1b2a1b. The remaining two are shown under the heading Mag Uidhir II (Maguire II). That is one of two places that you can read my 67 marker test results. The other is at www.ysearch.org under User ID G2K6P
These two outcasts are a cousin descended from a younger brother (Eli) of my great grandfather (William). My best match to date is a McManus at 62/67 markers. We project to a 99.95% probability of having a common ancestor 33 generations ago. Using a 50 to 70% probability, we shoud have a Most Recent Common Ancestor within the 13 most recent generations.