Welsh cywir

← Proto-Brythonic *köwir (inherited)

← Proto-Celtic *kowwīros (inherited)

← Proto-Celtic *kom (mention)

← Proto-Celtic *wīros (mention)

← Welsh cyf (prefix)

← Welsh gwir (prefix)

← Old Irish cóir (cognate)

→ Old English wær (cognate)

→ Welsh anghywir (prefix)