Thomas Marshall Riley was born about 1822, in Virginia, United States. He married Julia Ann Cannon on 30 September 1846, in St. Charles, Saint Charles, Missouri, United States. They were the parents of at least 4 sons. He lived in St. Charles, Saint Charles, Missouri, United States in 1850 and O'Fallon Township, Saint Charles, Missouri, United States in 1860. He died from 1860 to 1863.
English (Lancashire and Yorkshire): habitational name chiefly from High Ryley in Accrington (Lancashire) and Riley in Kirkburton, which was in the manor of Wakefield (Yorkshire). In some cases the name may derive from Riley Farm in Eyam (Derbyshire), Royley in Royton (Lancashire), or Rylah in Scarcliffe (Derbyshire). The placenames all come from Old English rȳge ‘rye’ + lēah ‘woodland clearing’.
Irish: from Ó Raghailligh ‘descendant of Raghailleach’, Old Irish Roghallach. This is the name of a chieftain family in Cavan, related to the O'Rourkes. In Anglicized form it has also been confused with Ó Raithile found in Munster, usually Anglicized as O'Rahilly or Rahilly . See O'Reilly .