Ó hAilpín
Ó hAILPÍN—I—O Halpin, O Halpeny, O Halfpenny, Halpin, Halpeny, Halfpenny; 'descendant of Ailpín' (diminutive of alp, a lump, a stout person). This surname appears to have originated in Co. Monaghan, but for centuries it has been found also in Co. Limerick. The anglicised forms O Halpeny, Halpeny, &c, represent an older form, Ó hAilpene.
Alphabetical Index to Irish Surnames