Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Proto-Celtic
*kebno-
→
Breton
kein
(inherited)
→
Welsh
cefn
(inherited)
→
Latin
Cebenna
(derived)
→
Middle Welsh
keuen
(inherited)