Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old French
acertener
←
Old French
a
(prefix)
←
Old French
certener
(prefix)
←
Old French
certain
(mention)
→
English
ascertain
(derived)