The Pentonie surname is derived from the English parish of Pentney, in Norfolk, near Swaffham. The place-name Pentney is thought to be derived from the Old English words "pent" meaning "enclosure" and "eye" meaning "island." The surname Pentonie was first found in Norfolk at Pentney, a village and civil parish about 8 miles (13 km) south-east of Kings Lynn that dates back to at least the 3rd or 4th centuries as evidence of a Romano-British local pottery industry was discovered and an ancient Roman road has been found running close to the settlement.