Arranged in tabular format, Heirlooms of Ireland provides the following information on some 2,500 Irish surnames: the surname and its variants, prefixes used with the name, the language from which the surname is derived, the century in which the surname can be traced in Ireland, the county or province in Ireland where the surname originated, a brief definition of the surname, the language from which the surname was derived, and pseudonyms for Irish surnames resulting from the British occupation of Ireland.