 In 1843 (after the Act of Parliament declaring him illegitimate was passed) he assumed his mother's surname of Dunn Gardner.The Dunn-Gardners were descended via William Dunn-Gardner, originally Dunn (d. 1831), and his wife Jane Gardner (d. 1839), who married in 1783 and had an only surviving daughter Sarah, mentioned above.Jane Gardner was herself the only surviving child and heir of her father John Gardner, Esq., of Chatteris House (d. 1804), who married his cousin, the daughter and heir of John Marriott, Esq., of Chatteris House by Barbara Johnstone, sister of his mother.