Umall
Umall, whence the name? Not hard to say. Umall, the servant of Fintan mac Bochra perished there at the hands of the Tuatha De Danann, when the first battle of Mag Tuired was fought between them and the Fir Bolg. Afterwards he was buried in Mag Reid, for that was its name before it was called Umall. Hence it was said: 'Umall, servant of noble Fintan, was buried in Mag Reid: hide not from assemblies of the clans the reason of the name Umall.'
Source:
Metrical Dindshenchas. ed and trans. Edward Gwynn. 1925. Dublin: Dublin Institute for Advanced Studies: 1991.