I attempted to respond 7/26/10, but I don't believe that I was successful as I got no confirmation to the message.
It has been 9 years since you posted this message.
My gr. grandparents name was Mc Quitty.My genealogy records match with part of what you posted.My gr.grandfather was William (1853).His parents were Sophia Mowery and Cary J. Mc Quitty(. Cary's parents were John Mc Quitty and Nancy (Walker)(1795) Mc Quitty.They were married in 1809.
I have not discovered the link between Samuel of Ireland and our Mc Quittys.Joyce