Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Catalan
ona
←
Proto-Indo-European
*unt-
(derived)
←
Latin
unda
(inherited)
→
Catalan
onejar
(affix)
→
Catalan
microona
(affix)