Gilliland Family History
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Gilliland Name Meaning
Scottish and northern Irish: reduced Anglicized form of Gaelic Mac Gille Fhaoláin (Scottish) or Mac Giolla Fhaoláin (Irish) ‘son of the servant of St Faolán’. Compare McClellan. Woulfe thinks that the Irish version died out and all modern forms were taken to Ulster from Scotland.
Source: Dictionary of American Family Names ©2013, Oxford University Press