Oaks and Shane - Thanks for the reply. I have not yet seen the site referred to by Shane, but I certainly will look.
The reason it is important to me is that I have two distinct families I am looking at as great-great-grandparents. The first was a marriage of John Kerns and Elizabeth Anne Quin in Loughgilly parish, Armagh, in 1851. John Kearns is listed in Griffiths as living in Ballydogherty, Loughgilly Parish, Co. Armagh (same townland as given on the marriage certificate.)
As I began my research, the only information I had about my great-grandfather stated he was born in Gilford (Co. Down), but claimed Armagh as his home county. A few weeks ago, I obtained immigration documents where my great-grandfather's birthplace was listed as "Lock Gillie", so I have some confidence that John Kerns/Kearns was his father, but, also that Gilford was part of the family geography.
The family left NI for Johnstone Scotland when my great-grandfather was about 10 years old. No explanation for the move found. In Scotland, I discovered a brother and two sisters' marriage - their father, John, was dead by 1877.
Also recently, I received details of a birth of a William James Cairnes to a John Cairnes and Betty Quin registered in Banbridge in 1865. I also found a death registered in Banbridge of a John Cairns. It occured in 1872 in Gilford.
The date(s) of the Valuation of Ballydogherty, Loughgilly Parish when John Kearns is listed could help me establish when (if these John Kerns/Kearns/Cairnes/Cairns are connected) the family might have left Ballydogherty for Gilford and where I might look for birth details for additional children.
Thanks again to both of you.
Donn Cairns
Colorado Springs, Colorado