Ó Glaisín
Ó GLAISÍN—I—O Glassyn, O Glissine, Glasheen; 'descendant of Glaisín' (diminutive of glar, grey); the name of a family who were anciently seated in the barony of Imokilly, Co. Cork, but long dispersed through Munster; now very rare.
Alphabetical Index to Irish Surnames