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DRENNAN Family HistoryThis interesting surname, of Irish origin with variant spellings Dreinan, Drinan, Drinnan, and Drynan, is an Anglicized form of the Gaelic "O'Draighneain" meaning "descendant of Draighnean", a byname from a diminutive of "draighean" meaning "blackthorn". The sept originated in Connacht where it has been frequently changed to Thornton by semi-translation. The surname dates back to the mid 12th Century (see below), and other early recordings include, John, son of James and Margaret Drennan, who was christened on June 20th 1611, at St.
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