Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Occitan
fe
←
Proto-Indo-European
*bʰeydʰ-
(derived)
←
Old Occitan
fe
(inherited)
←
Old Occitan
fides
(inherited)