Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Middle French
coeur
←
Old French
cuer
(inherited)
←
Latin
cor
(inherited)
→
French
cœur
(inherited)
→
Polish
kier
(derived)