Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
mefus
←
Franco-Provençal
mayossa
(cognate)
←
Occitan
majofa
(cognate)
→
Welsh
mefusa
(affix)