For background on how the map was made (and its flaws), see the relevant blog entry.
|Halfpenny||rare: Down. English, from nick-name or amount of rent. See Halpenny. DOS.|
|Halpenny||Quite numerous: Louth etc. Ir. Ó h-Ailpín, alp, a stout person. A sept of Monaghan. It has tended to be absorbed by its synonym Halpin, q.v.|