Irish féith

← Proto-Celtic *wētā (inherited)

← Irish cel-pro (mention)

← Irish féithchiúin (link)

← Old High German wesanēn (cognate)

← Proto-Indo-European *weh₁y- (root)

← Proto-Indo-European *weyh₁- (derived)

← Latin viēscō (cognate)

← Lithuanian výsti (cognate)

← Old Norse visna (cognate)

← Old Irish féith (inherited)

← Old Irish féth (inherited)

→ Irish féithchiúin (affix)

→ Irish féithpholladh (compound)

→ Irish meánfhéith (affix)

→ Irish féitheach (affix)