From FamilyTreeDNA.com - The chart below displays Y-Chromosome DNA (Y-DNA) STR results for the project in classic format. The columns display each project member's kit number, paternal ancestry information according to project settings, the paternal tree branch (haplogroup), and actual STR marker results (not included here).

Apparently Micajah and Jeremiah Casey were related but it is not known how. They lived in Wayne County during the same time frame from 1779-1790.

The neighbor's names in Jeremiah's Wayne County deeds had land grants along Aycock Swamp in 1783 and 1794. The swamp begins east of Fremont and flows north easterly to Black Creek so the land location could have been anywhere along the swamp courses. This would have placed Jeremiah on the north side of Neuse River and a good distance from Micajah on the south side of the river.

Dobbs County, NC - 1779 Voter List
At an election of one Senator and Two Members of the House of Commons to Represent the county of Dobbs held at the Court House the 10th and 11th of March, 1779, the following persons voted for Members of the House of Commons to wit: Jeremiah Casey, others. Kinston Daily Free Press from Mrs. B. Braxton Jones.

Jeremiah Case from Wayne County, NC and residence year 1780 signed two petitions endorsed 12 Feb 1782 to the General Assembly from inhabitants of Wayne County asking for new Commissioners. Census Reconstruction Records, 1660-1820. Ancestry.com.

Indenture made September 21, 1783 between John King and Jeremiah Casey both of Wayne, for 10 pounds land in Wayne joining Silas Hollowell lines and Joshua Davis line to the old road and containing 120 acres. Witnesses: Willis Bryant, Wm Sanders Lancaster, Joseph Martin. Proved October Court 1784. Wayne County, NC Register of Deeds, Bk 1, pg 259. Images

Wayne County, NC 1786 Tax List - Jeremiah Casey - Image

Jeremiah Casey, Wayne County, NC in 1786. NC Early Census Index database.

Jeremiah Casey, Wayne County, NC in 1788. NC Early Census Index database.

Indenture made 24 Jan 1788 between Etheldred Ruffin of Dobbs and John Skitto of Edgecombe, for 117 pounds land in Wayne on the south side of Great Contentnea Creek adjacent to the plantation whereon Jeremiah Casey formerly lived, Dunnaho Swamp, Ric'd Atkinsons line, Cornelius Outlands line containing 175 acres. Witnesses: John Stanton and Thomas Chittam. Wayne County, NC Register of Deeds; Bk 4, pg 178.

Wayne County, NC 1790 Census - Jeremiah Casey, 3 M under 16, 1 M 16 and over, 4 F

Indenture made July 29, 1796 between Jeremiah Casey and David Newsom both of Wayne, for $150 land in Wayne joining the lands of Silas Hollowell lines, John and Joshua Davis's lines, with the old road and containing 120 acres. Witnesses: Silas Hollowell and Demsey Deans. Recorded October Court 1796. Wayne County, NC Register of Deeds; Bk 5E, pg 396. Images

An online family tree for Jeremiah Casey indicates he was born in Carteret County, NC in 1754. A review of records for the county does not show his name but does offer a glimpse of other Caseys in the area at the time. Carteret County Caseys

It's possible Jeremiah in Richmond County is the same Jeremiah from Wayne County

Indenture made 4 Nov 1796 between John Denson and Jeremiah Casey both of Richmond, for 100 pounds land in Richmond lying on the rocky fork of Hedgecock Creek containing 200 acres. Richmond County, NC Register of Deeds, Bk C, pg 627. Images

Richmond County, NC 1800 Census - Jeremiah Casey, 1 M under 10, 1 M 10-15, 1 M 45 and over, 1 F under 10, 1 F 26-44

Richmond County, NC 1810 Census - Jeremiah Casey, 1 M 16-25, 1 M 45 and over, 1 F 45 and over

Jeremiah Casey Last Will and Testament, 1811
I give and bequeath to my two youngest sons James Casey and Lemmuel Casey my land where I now live. I give to my well beloved wife Nanny Casey the one half of my personal estate. The other half of my personal estate to be equally distributed amongst the rest of my children Samuel Casey, Sarah Sanderfer, Nancy Chittty, Betsy Johnston, Lovy Casey, Mary Casey and Zilpha Casey. Witnesses: Tilln Bryan and John Obryen. Richmond County, NC in open court Sep 1811 the within will and testament was proven by the oath of Tillotian Obryan and ordered to be registered. Ancestry.com. Images

Indenture made 25 Feb 1818 between James Casey and Lemuel Casey of the one part and Thomas Smith all of Richmond, for $400 land in Richmond lying on the rocky fork of Hedgecock Creek land conveyed to them in their father's will. Richmond County, NC Register of Deeds, Bk L, pg 101. Images