I thought to suggest that the spelling I have seen is Mohundro, - William T. Mohundro.I believe you have it "Mohungro". Somewhere I have a document with the name spelled this way.
So you'll BOTH know.There is only the "WAY BACK" connection between your branch of the Flys in Illinois and the three half-Cherokee brothers who pioneered to Davidson Co., TN in 1796. Your ancestor William Boykin Fly was a schoolteacher back in North Carolina.He came to West Tennessee considerably later than the three brothers came to Davidson county before the turn of the century; and apparently he only stayed briefly in Tennessee before moving on to Illinois.He married off his sister Winnie Fly before moving on to Illinois. She married Minor C. Cole and they reared a family in Dyer County, TN. It was one of HER sons who told a historian about 1923 about his mother coming to Tennessee with her brother.He named her "Winie", as I recall. Said HER parents never left the Carolinas. William and Winnie were two of the siblings named in the Will of their father, John, son of Amelius.The latter was a son of John Fly, b. ca. 1744. Amelius (Emelius) was a half brother of John Dixon Fly, b. ca. 1765, my ancestor. - With regard to "Winie", spelling left a lot to be desired in those days.
I'm pleased to hear from you again. Stay in touch.