Comment on Metcalf by Doris Summers

I am the great great granddaughter of John A Metcalf who was born about 1812 in Tennessee. He married Mary ? She was born in 1812 in North Carolina. They had 8 children:
1. Octavia Lucerne Metcalf, born 3 Feb 1856; died 8 Oct 1933 in Jackson County Newport Arkansas
2. William Preston Metcalf born 1835 in Alabama
3. Elizabeth Metcalf born 1838 in Tennessee
4. Melvinnie Metcalf born 1841 in Tennessee
5. George T Metcalf born 1843 in TN
6. Martha Metcalf born 1846 in TN
7. Rebecca Metcalf born 1846 in TN
8. Sarah C. Metcalf born 1845
I have been looking for Mary’s last name. My guess is that they were married between 1828 and 1835. I was looking in White County Tennesse because that is where they were living around 1840.
Does anyone have any information on this family to share with me?