professional rugby league footballer William Prosser, Lord Prosser (1934–2015), Scottish judge William Farrand Prosser (1834–1911), American politician William Henry Prosser (1870–1952), Welsh cricketer William Lloyd Prosser (1898–1972), American legal scholar See also Prodger Prosser (disambiguation) Rosser (disambiguation) References Surnames of Welsh origin Anglicised Welsh-language surnames Patronymic surnames Surnames from given names