Welsh
arth (Welsh) 'bear' (*rtko-), whence ML Artorius 'Arthur': ARTHUR.
bod (Welsh) 'to be' (*bheuª-): EISTEDDFOD.
bro (Old Welsh) 'border, region': CAMBRIA, CYMRY.
bwga, bwg (Middle Welsh) 'ghost': BUGBEAR.
bwgwl (Welsh) 'menace': BOGLE.
bygel (Welsh) 'ghost': BOGLE.
caled (Welsh) 'hard' (*kal-3): EXCALIBUR.
ci (Welsh) 'dog' (*kwon-): CORGI.
cibi, cibwst (Welsh) 'kibe': KIBE.
cor (Welsh) 'dwarf': CORGI.
crwn (Welsh) 'crooked, arched': CROMLECH.
crwth (Welsh), ancient Celtic instrument (*krut-): CROWD.
dwn (Welsh) 'dull brown color' (*dheu-1): DUN.
eneit (Middle Welsh) 'soul': ENID.
gwalch (Welsh) 'hawk': GAVIN.
gwan, gwynn (Welsh) 'white' (*weid-): GUINEVERE, PENGUIN.
gwlân (Welsh) 'wool' (*welª-1): FLANNEL.
gwydd (Old Welsh) 'wild': GAEL, GOIDELIC.
gwylan (Welsh) 'gull': GULL.
kom- (Old Welsh) 'with': CAMBRIA, CYMRY.
llech (Welsh) 'flat stone': CROMLECH.
llwyd (Welsh) 'gray': LLOYD.
llymru (Welsh) 'flummery': FLUMMERY.
map (Old Welsh) 'son, youth': MABINOGION.
pen (Welsh) 'chief, head': PENDRAGON, PENGUIN.
sedd (Welsh) 'seat' (*sed-1): EISTEDDFOD.
turr (Old Welsh) 'tor': TOR.