Etymology
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Fergus 
masc. proper name, from Gaelic Fearghus or Old Irish Fergus "man-ability," first element cognate with Latin vir "man" (from PIE root *wi-ro- "man"); second from Old Irish gus "ability, excellence, strength, inclination," from Celtic root *gustu- "choice," from PIE root *geus- "to taste; to choose."
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*wi-ro- 
*wī-ro-, Proto-Indo-European root meaning "man."

It forms all or part of: curia; Fergus; triumvir; triumvirate; Weltanschauung; Weltschmerz; werewolf; wergeld; world; virago; virile; virility; virtue; virtuosity; virtuoso; virtuous.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit virah, Avestan vira-, Latin vir, Lithuanian vyras, Old Irish fer, Welsh gwr, Gothic wair, Old English wer "a man."
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*geus- 
Proto-Indo-European root meaning "to taste; to choose." It forms words for "taste" in Greek and Latin, but its descendants in Germanic and Celtic mostly mean "try" or "choose." The semantic development could have been in either direction.

It forms all or part of: Angus; choice; choose; degustation; disgust; Fergus; gustation; gustatory; gusto; ragout; Valkyrie.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit jus- "enjoy, be pleased;" Avestan zaosa- "pleasure," Old Persian dauš- "enjoy;" Greek geuesthai "to taste;" Latin gustare "to taste, take a little of;" Old English cosan, cesan, Gothic kausjan "to test, to taste of," Old High German koston "try," German kosten "taste of."
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