Nexus Clonakilty, West Cork and Charlestown and Columbia South Carolina, USA of Deasy and Bateman families
An example is Charles Bateman of Clonakilty, emigrated to South Carolina 1852 and was naturalised 1870 aged 48. He would have gone out to a well established network of relatives who would have migrated from at least the early 19th century.
And http://homepages.rootsweb.ancestry.com/~sharonmh/Cork. Registers will take you to a list and links to all of register extracts—Bateman is one of the surnames I always take note of and there are numerous parishes there that have Batemans.