The Manapii are an ancient tribe from southeastern Ireland mentioned by Greek geographer Ptolemy in the 2nd century AD. They were later attested as (Fir) Manach (var. Manaig, Monaig) in the Early Christian period, a tribe dwelling further north in County Down and near Lough Erne which gave its name to the modern County Fermanagh. Early Irish genealogists mentioned that the Manaig had emigrated from the south of Leinster.