Very numerous: all areas: particularly Leath Chuinn (northern half). Ir. Mac Gabhann, which is linked to Cavan. See Mac Gowan and Smyth.
Very numerous: all areas, especially Ulster and Midlands. Ir. Mac Gabhann, Mac an Ghabhann (son of the smith). The Irish name was widespread and generally changed to Smith/Smyth. Branches in Clare and Tipperary were traditional historians. Many are also of Scottish or English origin in Ulster. See also Mac Gowan. SGG & IF.