Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Occitan
mes
←
Old French
mois
(cognate)
←
Latin
mensis
(inherited)
→
Catalan
mes
(inherited)
→
Occitan
mes
(inherited)