1) Irish boy name 
The surname Mulcahy is of Irish Gaelic origin, being anglicised from `Ó Maolchathaigh`. The Ó Maolchathaigh sept most likely originated in County Waterford, and 16th and 17th century records show that the family was most numerous in that county as well as Cork and Tipperary. ==Etymology== The surname refers to `a descendant of a devotee of Ca......