Old English swā

→ English so (inherited)

→ Old English eallswa (compound)

→ Old English swelc (suffix)

→ Middle English so (inherited)

→ Middle English se (mention)

→ Westrobothnian sä (cognate)

→ Icelandic svo (cognate)

→ Old Norse svá (cognate)

→ Scots sae (inherited)

→ Yola zo (inherited)