From Middle English rixen, from Old English rīxian, rīcsian (“to exercise or have power, rule, bear rule, govern, reign, domineer, dominate, tyrannize, exercise violence, prevail”), from Proto-Germanic *rīkisōną (“to rule”), from Proto-Indo-European *h₃reǵ- (“chief, king”). Cognate with Middle High German richsen (“to reign”), Lithuanian rikis (“knight”). More at riche.
rix appears in various Gaulish proper names:
rix f (pl)
- Collective plural of