Wallonus Save DMLBS Wallonus [cf. Wallanus, Wallus], of the (Celtic) people of the former Roman Britain, ‘British’, ‘Welsh’, (in quot. as sb. m.) ‘Briton’, ‘Welshman’. in ista insula habentur quinque gentes, Angli, Britoni, Waloni, Scithi et Picti AS Chr. pref..