Middle English who

← Old English hwā (inherited)

← Proto-Germanic *hwaz (inherited)

← Proto-West Germanic *hwaʀ (inherited)

← Proto-Indo-European *kʷos (inherited)

← Proto-Indo-European *kʷis (mention)

→ English who (inherited)

→ Middle English whos (mention)

→ Scots wha (mention)

→ Yola fho (inherited)