[Ir., manstrength; virility; male outflow; semen (?); cf. L virogustus, choice of men].
Name borne by dozens of figures from early Irish history, genealogy, mythology, and legend, as well as in Scottish and Arthurian traditions, including kings, warriors, poets, and saints. The name may once have been a cultic attribute of kingship, implying equine associations, and was especially popular in the king lists of early Ulster. The most often cited personage is probably Fergus mac Róich, fabled reciter of the Táin Bó Cuailnge [Cattle Raid of Cooley].