English: variant of Julian.Irish (Tyrone and
Derry): reduced Anglicized form of Gaelic Mac Gileáin ‘son
of Gileán’, a variant of the personal name Gealán,
from a diminutive of geal ‘bright’, ‘white’.
Dictionary of American Family Names, Oxford University Press, ISBN 0-19-508137-4
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Historical Documents & Family Trees with Gillian
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The information for this chart came from the U.S. Immigration Collection at Ancestry.co.uk.
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