Mac Giolla Sheachlainn
Mac GIOLLA SHEACHLAINN—IV—M'Gillaghlin, MacGlaughlin, MacClachlin, MacClafflin, Clafflin; 'son of Giolla Sheachlainn' (servant of St. Secundinus); the name of an old Meath family who were lords of Southern Breagh until soon after the Anglo-Norman invasion, when they lost their power and were dispersed. The present anglicised forms of Mac Giolla Sheachlainn cannot be distinguished from those of Mag Lochlainn, Mag Lachlain, which see; but that the family is still extant is shown by the variant Mac Giolla tSeachlainn, which see.
Alphabetical Index to Irish Surnames