St. Cornelius and St. Cyprian - St. Cyprian of Carthage and Pope St. Cornelius were contemporaries and allies, and they share a feast day. Short lives of both saints, suitable for children. - http://www.tntt.org/vni/tlieu/saints/St0916.htm
Cronan - There are several Irish saints of this name. Brief biographies of St. Cronan of Roscrea and St. Cronan Mochua of Balla. Mentions St. Cronan of Clonmacnoise, St. Cronan of Moville, St. Cronan Mochua of Clashmore, St. Cronan Mochua of Sliabh Eibhlem; plus - http://www.newadvent.org/cathen/04514d.htm