Proto-Slavic *Vęťeslàvъ

→ Belarusian Вячаслаў (inherited)

→ Polish Wacław (derived)

→ Polish Więcław (inherited)

→ Russian Вячеслав (inherited)

→ Ukrainian В'ячеслав (inherited)

→ Old Novgorodian Вѧцьславе (inherited)