Ó Fallamhain
Ó FALLAMHAIN—I—O Fallowne, O Fallone, O Fallon, Falloon, Faloon, Faloona, Fallon, &c.; 'descendant of Fallamhan' (ruler); also written Ó Follamhain, and sometimes, by the aspiration of the initial f, changed to Ó hAllamhain, which see; the name (1) of a Leinster family who were formerly lords of Crioch na gCeadach, which comprised the present parish of Castlejordan in Offaly; and (2) of a Connacht family who were lords of Clann Uadach, which comprised the parishes of Camma and Dysart, in the barony of Athlone. In 1585, O'Fallon had his residence at Milltown, in the parish of Dysart, where the ruins of his castle are still to be seen.
Alphabetical Index to Irish Surnames