No real evidence exists for the origin of Swacker. All that is known is that Mary Swacker claimed her parents were both from Virginia. My guess is that Swacker is a distorted spelling of something else. TWO Swacker surnames (relatives of Mary Gregg?) are listed in the 1850 U.S. Census of Clark County...both in Springfield Township. Margaret Swacker (bc. 1832) is living with James and Lydia Dallas. William Swacker (bc. 1836) is living with James and Mary McBeth. Records show that Margaret Swacker married Charles F. King at CLARK COUNTY in late 1850.
James M Gregg fought in the Civil War and his wife Mary applied for a pension after his death. Apparently, James M. Gregg (bc. 1822) was born in RICHLAND COUNTY OH to Abel Gregg and Hannah (DESELMS). This Abel Gregg traces back to a John Gregg & Elizabeth (COOKE) in the late 1600's in VIRGINIA. Abel Gregg is the only person named Gregg listed as living in RICHLAND COUNTY in the 1820 U.S. Census of Ohio.
Some have suggested Uriah Gregg as the possible father of James M. Gregg. Uriah Gregg is living in COLUMBIANA COUNTY OH in 1830 before moving to RICHLAND COUNTY OH by 1840. The census record from 1830 does not support James M Gregg as Uriah's son based on the identity/births of his other sons. Uriah Gregg also traces back to a John Gregg & Elizabeth (COOKE) in late 1600's VIRGINIA.
No census record exists for Abel Gregg in 1830. All that is known is that he died at SENECA COUNTY OH in August 1833. His wife Hannah died in 1865. The father of Abel Gregg (Samuel Gregg) died at LOGAN COUNTY OH in 1843. This Samuel Greg migrated to Ohio around 1800 and was in ROSS COUNTY OH at that time. He fought in the Revolutionary War and left Virginia to claim a land warrant. Samuel was in BELMONT COUNTY OH in 1810.