Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Walloon
saetchî
←
Old French
sachier
(inherited)
←
Latin
-are
(cognate)
←
Walloon
saetch
(affix)
←
Walloon
-î
(affix)