William Gregg was born in 1616 in Glenary Barony, Antrim, Ireland to John Gregg. William inherited his father's barony and the ivory-headed cane which his father decreed should be handed down to the second son, since the first inherited the land. In May of 1653, William left his Glenarm Barony, County Antrim in northern Ireland by ship and settled with his family on the southwest shore of Waterford County, southern Ireland at Ardmore. William had three sons, two of whom died. He died in 1672 in Ardmore County, Waterford, Ireland.
|Offspring of John Gregg and Ann Palmer (1576-1651)|
|William Gregg (1616-1672)||1616 Glenary Barony, County Antrim, Northern Ireland, United Kingdom (+ Atrim+ Ireland)||1672 Ardmore, County Waterford, Republic of Ireland|
|Offspring of William Gregg and unknown parent|
|William Gregg (1642-1687)||1642 Waterford, County Waterford, Republic of Ireland||1 July 1687 New Castle County, Delaware, United States|| Martha Ann Wilkinson (c1644-1692)|