There is uncertainty as to whether Onslow is a fictional name as this author has not been identified. Bookseller
Jonathan Wantrup comments on the novel
Jonathan Onslow, Pioneer that 'The author is unknown, but it has been attributed to a member of the Macarthur-Onslow clan; the editor, Sampson Low, is better known and there is no reason to believe that he was anything more than an editor...' September 1997
Australian Colonial Literature Catalogue. There is a John Onslow in the New South Wales Registry of Births, Deaths and Marriages.