Martin--Cockrell/Cottrell marriage SC

I have been advised by a Genforum contributor that Moses Cockrell of South Carolina changed the spelling of his surname to Cottrell when he moved to Mississippi. I was advised to post the following query on the Cottrell Forum on the possibility that a Cottrell researcher has the documentation I seek.Many Cockrells in Noxubee Co. MS are descendants of the family of Moses Cockrell [later Cottrell] & Jane Young, of Fairfield Co. SC. Does anyone there have documentary evidence [family Bible or whatever] that can prove the reported marriage (in SC) of Moses' daughter Sarah (b. ca. 1763) to Andrew Martin (1760-1814) ?
The marriage of Moses' grand daughter Nancy A. Cockrell (daughter of Jeremiah) to James Martin, Andrew Martin's son, is fairly well established. This was a second marriage for both. Nancy Agnes Gladney and Dr. George Elliott were their first spouses, respectively.
Documentation from Mississippi, South Carolina--or anywhere--concerning these marriages would be most welcome.JHA