Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Norman
cèrtain
←
Old French
certain
(derived)
←
Latin
*certānus
(mention)
←
Latin
certus
(derived)
→
Norman
cèrtainement
(suffix)