- This family are descended from William Penn founder of the state of Pennsylvania, United States of America. William Penn of Shanagarry, county Cork had a daughter and heiress Christiana Gulielma Penn who married Peter Gaskell of Bath. They were the parents of Peter Gaskell of Bath and Philadelphia who assumed the additional name of Penn in 1824. His second son Thomas of Ballymaloe, county Cork and Pennsylvania died in 1848 and was succeeded by his brother Peter Penn Gaskell. At the time of Griffith's Valuation the Penn Gaskell estate was located mainly in the parish of Kilmahon but also in the parishes of Bohillane and Cloyne, barony of Imokilly. In the 1870s Peter Penn Gaskell of America owned 1,913 acres in county Cork.
- A family settled in the vicinity of Carrigtuohill near Cork city from the mid 17th century. Alexander Durdin of Shanagarry, born 1712, married four times. His third wife was Anne Penn widow of William Penn, grandson of the founder of Pennsylvania and Sir Bernard Burke states that through her Alexander came to possess estates in Ireland and America. His fourth wife was Margaret daughter of Warham St Leger. Warham Durdin was the eldest son of the fourth marriage. He lived at Sunville, Dromadda and Midleton Lodge and by his wife Anne Garde had 10 children. Their son Thomas Durdin of Shanagarry Castle held land in the parishes of Ballintemple, Ballyoughtera, Cloyne, Kilmahon, barony of Imokilly at the time of Griffith's Valuation. In June 1855 the fee simple estate of Thomas Garde Durdin amounting to 1,650 acres in the barony of Imokilly was advertised for sale. The representatives of Thomas Durdin, Shanagarry, owned 935 acres in the 1870s. Members of this family also owned land in county Carlow.