William Ponsonby, 2nd Earl of Bessborough (1704–1793), British & Irish MP, Chief Secretary for Ireland, Postmaster-General of Great Britain
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It is also possible that it was named in honour of any of several noted persons called Ponsonby, including the Postmaster General of Canada of 1784, William Ponsonby (1744-1806).
Grattan, Lord Charlemont, Ponsonby, Plunkett, and a few patriots, continued to protest against the sale of the liberties and free Constitution of Ireland.
Thus, if any is to blame in the short-lived 'Fitzwilliam episode' it is the great Irish politician Henry Grattan and the Ponsonby brothers - presumably William Ponsonby, later Lord Imokilly and his brother John Ponsonby—not to mention Lord Fitzwilliam himself.
William Ponsonby, 1st Baron de Mauley (1787–1855), British Member of Parliament for Poole, Knaresborough and Dorset
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William Ponsonby, 1st Baron Ponsonby (1744–1806), Member of Parliament for Bandonbridge and Kilkenny, Postmaster-General of Ireland
On 2 June 1759 Ponsonby left the Treasury and was appointed Postmaster General of Great Britain jointly with Robert Hampden-Trevor, 1st Viscount Hampden.