Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old French
trois
←
Latin
trēs
(inherited)
→
French
trois
(inherited)
→
Middle French
troys
(inherited)
→
Walloon
troes
(mention)