William Wellesley-Pole, 3rd Earl of Mornington (1763–1845), who married Katherine Forbes, daughter of Adm. Hon. John Forbes and Lady Mary Capell (a daughter of the 3rd Earl of Essex, in 1784. Francis Wellesley (1767–1770), who died in childhood.
William is a male given name of Germanic origin. It became very popular in the English language after the Norman conquest of England in 1066, and remained so throughout the Middle Ages and into the modern era. It is sometimes abbreviated "Wm." Shortened familiar versions in English include Will, Willy, Willie, Bill, and Billy.
Wellesley-Pole, William, (1763-1845), 3rd Earl of Mornington, statesman Westenra, Derrick Warner William, (1853-1921), 5th Baron Rossmore Westenra, Henry Robert, (1792-1860), 3rd Baron Rossmore