Proto-Slavic *dǫga

→ Czech duha (inherited)

→ Polish dęga (inherited)

→ Romanian dungă (derived)

→ Russian дуга (inherited)

→ Russian радуга (inherited)

→ Serbo-Croatian duga (inherited)

→ Serbo-Croatian дуга (inherited)

→ Slovak dúha (inherited)

→ Silesian dynga (inherited)

→ Silesian danga (inherited)

→ Ukrainian райдуга (inherited)