Below is a link to a site which has Daniel McFarland's Family Tree b. County Tyrone Ireland. It lists two Grays who married into the family. It also mentions which of his children migrated to various places such as: Maine, Pennsylvania, Ohio, Virginia, and North Carolina.

After reading your post, I thought you might be interested in the information here. The sources seem to be solid.

http://www.geocities.com/Heartland/Hollow/8143/genealogy/mcf...