A ancestor of mine William Cannon married an Ardena Caroline Harkey in 1871, they moved to San Saba Tx from Yell,County AR. In an 1870 Yell county census for the township of Delaware their are 4 Harkey girls, Mary 13,Martha J 11, Sarah A 9, and Sue 7, all born in TX. They are living in the home of William D. and Polly E. Hopskins with thier child Armine 17. It would be worth your while to check into Yell co. AR, there are many Harkey's in that area. I hope this helps.