Lydia S. Elrod + John (Earnest?) Davis

Could someone help me with this line? Several years ago I believe someone shared a tree with these two (Lydia was the daughter of Abraham Jr.) John Earnest Davis (as I put it in my tree was listed as the son of Reason Davis (I've since heard it was spelled "Rezin"), born 1798, and Mary Ann ?, born 1804.)
I've since found this couple with a whole different set of children including a John who was born long after John Earnest. Does anyone know about this connection John Earnest and Reason (Rezin?)
My computer had crashed since then and I no longer have this information.