Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Occitan
tres
←
Proto-Indo-European
*tréyes
(inherited)
←
Proto-Italic
*trēs
(inherited)
←
Latin
trēs
(inherited)
←
Old Occitan
tres
(inherited)
→
Occitan
tresen
(affix)