Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Occitan
cinc
←
Proto-Indo-European
*pénkʷe
(inherited)
←
Latin
quīnque
(inherited)
←
Old Occitan
(inherited)
→
Occitan
cinquen
(affix)