Old Irish cía

← Proto-Celtic *kʷēs (inherited)

← Welsh pwy (cognate)

← Proto-Indo-European *kʷis (derived)

← Old Irish airm (mention)

→ Welsh pwy (cognate)

→ Irish ge (inherited(ga/gd))

→ Irish cé (inherited)

→ Irish cé (inherited)

→ Scottish Gaelic cò (inherited)

→ Manx quoi (inherited)

→ Cornish piw (cognate)

→ Middle Irish cía (inherited)

→ Old Irish cid (link)

→ Old Irish cía indas (mention)