We had this query recently, and on that occasion possible descent was identified from Thomas Quilliam bap. 26 May 1782. There are three similar entries for this individual in the IGI, relating to Santon and Malew. I think the original was at Malew. The parents were Robert Quilliam and Judith or Jony Quine. They were both buried at Malew but neither left a will. Jony or Judith is definitely a sister of my 3xgreat-granfather John Quine of Arderry, Baldwin, 1761 - 1856. Some Quilliams later turned up in East Baldwin as landowners - I think William Quilliam of Port e Chee owned part of Creg e Cowin c1840, but he died 1870 aged 70 so if there is any connection he would be perhaps a grandson of Robert and Jony.
Any further info. on Robert and Jony would be welcomed.
Nigel.