Fir Ol nEchmacht was the name of a group of people living in pre-historic Ireland. The name may be translated as 'men' of the 'people' 'of Echmacht', the last being the given name of the people or their territory, perhaps from ech ('horse') and macht. T. F. O'Rahilly believed they are connected to, or the same as, the Nagnatae tribe, mentioned in Ptolemy's second-century AD work Geography, but O'Rahilly's model of the early populating of Ireland is not well-accepted by modern scholars.