Breton ugent

← Proto-Celtic *wikantī (inherited)

← Welsh ugain (cognate)

← Proto-Indo-European *h₁wih₁ḱm̥t (inherited)

← Proto-Indo-European *dwi(h₁)dḱm̥ti (mention)

← Latin vīgintī (cognate)

→ Breton daou-ugent (compound)

→ Breton tri-ugent (compound)

→ Breton pevar-ugent (compound)

→ Welsh ugain (cognate)

→ Latin viginti (cognate)