In your KIRKLAND investigations have you seen KIRKLEY? I have found both KIRKLAND and KIRKLEY in Chesterfield, SC and most recently I have discovered KIRKLAND and KIRKLEY in Collins, Fayette Co., AL in 1880. My people are Nancy KIRKLEY, widow in 1880 in Collins, Fayette Co., AL. In that same location is a John KIRKLAND age 23. I'm assuming that John KIRKLAND is most likely a relative of Jehu KIRKLAND or one of Jehu's sons.
1830 & 1840 I have found both KIRKLEY and KIRKLAND.
Through the census records I have found Willis KIRKLEY as Willis KIRKLAND. Same for George KIRKLEY and George KIRKLAND