Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Proto-Celtic
*swādus
→
Gaulish
suados
(inherited)
→
Gaulish
Suadurix
(derived)
→
Irish
Sadhbh
(derived)