Heron/Hern in Virgina, KY, MO, (from Ireland) L-21+ DNA

My son is a direct descendant of a John Hern
b. 1775/Virginia.This John has been IMPOSSIBLE to document marriage, parentage or anything else for that matter prior to 1850.I see there are a couple of "John Hern's" listed in the KY census in 1810, 1830 etc., but I can't verify these.There are rumors that John's father was a Joel/Jolt Hern from Ireland, but I think that is sheer speculation someone started on the internet. I didn't help this by posting this on a surname project before I knew better.John had 3 children, William, Shelton, and Henry on the 1850 census. I'm sure he had other children who would have been older, but I can't verify any other this.

My son's lineage is this:

John Hern b. 1775 VA m. 1st wife Unknown/2nd wife Spicy Stice Tune (widow of Benjamin Tune)
William Hern b. 1831 Boone County, MO m. Helen Wilson
d. 15 July 1903 Goingsnake District, Cherokee Nation,
Indian Territory (now Westville, Adair OK)
James Lewis Hern b 19 Mar 1877 Goingsnake
District, Cherokee Nation, Indian Territory (now
Westville, Adair OK) m. Malinda Jane Waters
d. 9 Apr 1961 Westville, Adair Co., Oklahoma
Buford Hern b. 1916 Westville, OK m. Ruth
Trickett d. April 1961 McClennan Co, Waco, TX


I'm hoping to connect to other Hern/Heron families to try and connect the missing pieces and perhaps compare dna results.My son's are posted at FTNDA under William Hern b. 1831 MO (or John Hern b. 1775 VA).He tested positive for L-21 which is some kind of genetic link to an Irish "kingpin" named Niall of the Nine Hostages.In addition, according to other dna sites, my son's dna origen is Germanic which would make sense if the other information I've read about them going from Germany to Ireland then to America.

Hope to hear back from others.I strongly recommend the DNA test for anyone who may think they are related to this Hern/Heron family.The link to Niall of the Nine Hostages is a genetic study that has been going on for some time.