From Ó Móráin, ‘great’ — distinct septs across Mayo, Roscommon and Leitrim, part of the old Uí Fiachrach kindred.
The Moran certificate.
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Gaelic Origin · Root meaning ‘great’
Moran comes from mór, ‘great’, most likely a byname for size or standing rather than a title. Unrelated Ó Móráin septs held ground across Mayo, Roscommon and Leitrim, part of the wider Uí Fiachrach kin-group that once dominated north Connacht.
A name simple enough to mean exactly what it says, claimed independently by enough families that ‘great’ became, across three counties, an ordinary surname rather than a boast.
Irish form: Ó Móráin
