Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Cornish
ster
←
Proto-Celtic
*sterā
(inherited)
←
Proto-Indo-European
*h₂stḗr
(inherited)
→
Cornish
steren
(suffix)
→
Cornish
stervarner
(affix)