Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
cymylog
←
Breton
koumoulek
(cognate)
←
Welsh
cwmwl
(affix)
←
Welsh
-og
(affix)
←
Cornish
komolek
(cognate)