Fergus
[ˈfɜrɡəs]Meaning
from Old Irish fer "man" and guss "vigour, strength, force"
Background Story
Fergus is the Old Irish form of the name, and the usual Anglicised form of the Modern Irish Fearghas or Fearghus. Behind the Name derives it from the Old Irish elements fer, "man", and guss, "vigour, strength, force", giving the meaning "man of vigour". Wiktionary, which takes the name from Irish or Scottish Gaelic Fearghas, records a different reading of the second element as "choice", so that the name has been understood as either "most chosen one" or "chosen man". It was borne by several early rulers of Ireland and Dál Riata, by many characters from Irish legend, and by an 8th-century saint who was a missionary to Scotland.

Related Names
Fraser
From a Scottish surname, originally Norman French de Fresel
Walwin
Recorded as a masculine given name in the Arthurian Cycle
Ahanu
No documented meaning in the sources checked
Anoki
Recorded as a masculine given name in Sioux
Astrid
Modern Scandinavian form of Old Norse Ástríðr, from áss (god) and fríðr (beautiful)
Borris
A variant of Boris, meaning 'fighter' or 'defender'.
Brigid
Irish variant of brighid; 'exalted one'
Callam
Recorded as a given name in English (masculine)
Caspar
Latin variant of jasper
Cassan
Recorded as a masculine given name in Venetian