Old Irish guidid

← Proto-Celtic *gʷedyeti (inherited)

← Welsh gweddïo (cognate)

← Proto-Indo-European *gʷʰedʰ- (root)

← Proto-Indo-European *gʷʰédʰyeti (inherited)

→ Welsh gweddïo (cognate)

→ Irish geis (mention)

→ Irish guigh (inherited)

→ Scottish Gaelic geas (mention)

→ Scottish Gaelic tairg (affix)

→ Scottish Gaelic guidh (inherited)

→ Old Irish doguid (affix)