Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Catalan
bruc
←
Gaulish
*brūcos
(derived)
←
Proto-Celtic
*wroikos
(derived)
→
Catalan
bruguera
(affix)