sentences:  So the full name of Ó Maolchatha means 'A descendant of a devotee of Cathach' most likely the name of a saint.There exists a popularly circulated theory regarding the Mulcahy families origins.The theory first proposed by historian John O'Hart in his highly flawed work, Irish Pedigrees, claims that the Mulcahy family descend from the O'More family of County Laois.