Marjorie and I were discussing our early ancestors--there's a John Harshaw of Bangor (not Maine, Ulster) recorded in the 1630's or so--and when they might have entered Ireland. Glancing at the wikipedia.com entry for the Ulster Plantation corrected some of my misimpressions, and suggested John might have been part of the Hamilton settlement.
Googling brings us to this interesting website on Hamilton/Montgomery. The website even includes a map with "Bangor" at the top (on the Belfast Lough). Unfortunately, the website apparently was put up in connection with the 400th anniversary of the settlement (in 1606) and hasn't been added to since.