It's been some time since I checked this forum - good to see you are still looking for the origin of Mhoon.
The Mrs. L.T. (Mhoon) Pride you asked about is Mary Mhoon, the oldest daughter of James G. Mhoon and Mary Goodloe.She often appears on records as Mae Mhoon.b. 1867 d. 1858 in Tuscumbia, Al.
She is my great aunt, sister of my grandmother, Lulie Christine Mhoon.I have clear memories of visiting Aunt Mae in the late 1930's.
Her father James G. Mhoon,a noted Confederate cavalry scout, is the son of Willim Spivey Mhoon, son of John Mhoon, son of Josiah Mhoon.
The epitaph on the monument to William S. Mhoon in the Mhoontown cemetery reads,
"William Spivey Mhoon was the son of John Mhoon and Mary his wife b. Martin Co NC 25 Nov 1761 d. 4 Mar 1816
he was the son of Josiah Mhoon and Mourning, his wife"
It'a been some years since I looked at the abstract of Josiah's will in Grimes Abstracts of North Carolina Wills, v.1 p. 250.My notes indicate four sons - Josiah, James, John, and Jesse, and two daughters Ann and Edee, and that a plantation was deeded to each of the two older sones.
I have a lot of material - land records, court proceedings, etc. - that I copied at the Family History Library in Salt Lake City that I havn't reviewed.I'll try to go through them soon and see if there is anything that would support a name change from Mohoon to Mhoon, and any mention of a Zachariah Mohoon.