Welsh cwyn

← Breton keina (cognate)

← Proto-Germanic *kwainōną (cognate)

← Proto-Indo-European *gʷey- (derived)

← Old Irish cóine (cognate)

→ English dudgeon (mention)

→ Welsh achwyn (affix)

→ Welsh cwynion (affix)

→ Welsh cwyno (affix)

→ Irish caoin (cognate)

→ Scottish Gaelic caoin (cognate)