Fomhóire
Which means ‘from the sea’ and is the name of the gods of night and death and cold. According to myth, the Fomhóire (or Fomorians) were mis-shapen and had now the heads of goats and bulls, and now but one leg, and one arm that came out from the middle of their breasts. They were the ancestors of the evil faeries and, according to one gaelic writer, of all misshapen persons. The giants and leprecauns are expressely mentioned as of the Fomhóire.
Source: http://www.mediatel.lu/team/nmack/mmp_myth_fomhoire.html