Arthur Wyatt was the son of James Wyatt. He married Margaret Louisa Bonham, daughter of Reverend John Bonham and Barbarina Norris, on 29 November 1855. He died on 2 April 1887.
He lived at Earlswood, County Wexford, Ireland and at Tan-y-Bryn, Bangor, Caernarvonshire, Wales. He held the office of Justice of the Peace (J.P.) and had four sons and two daughters.