Proto-West Germanic *swā

→ English so (inherited)

→ Afrikaans so (inherited)

→ Old English swa (inherited)

→ German so (inherited)

→ Middle Dutch so (inherited)

→ Middle English so (inherited)

→ Old High German sus (derived)

→ Dutch zo (inherited)

→ Dutch zus (derived)

→ Old Dutch so (inherited)

→ Old Saxon so (inherited)

→ Yola zo (inherited)