Ancient Greek ὀγδοήκοντα

← Proto-Indo-European *oktōḱomt (inherited)

← Proto-Indo-European *oḱto(w)-dḱomt (mention)

← Latin octōgintā (cognate)

← Old Armenian ութսուն (cognate)

→ Greek ογδόντα (inherited)

→ Greek ογδοήκοντα (borrowed)

→ Latin octoginta (cognate)

→ Sanskrit अशीति (cognate)