Colleran
Irish: Anglicized form of Gaelic Ó Callaráin ‘descendant of Callarán’, which is probably a diminutive of the byname Callaire ‘cryer (bellringer)’,although Woulfe suggests it may be from the Connacht name Mac Allmhuráin.
Spelling variations of this family name include: Colleran, Calleran, Callerain, Caleraine, O'Colleran, O'Calleran and many more.

First found in counties Mayo and Galway.