Some records seem to suggest that Sir Walter Calverley's mother was Joanna (Joan) Bigod; others seem to suggest his mother was one Joan Normanvillle. Both share a similar first name and similar birth date. Information from The Calverley Charters, Presented to the British Museum, by Sir Walter Calverley Trevelyan, Baronet, Vol. I, Notes on the Pedigree, Introduction suggests that Sir Walter Calverley was married three times, the last to Joanna Bigod, daughter of Sir John Bigod and Constance de Mauley.