Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Gaulish
Orgetorix
←
Proto-Celtic
*orgeti
(derived(cel-gau/la))
←
Proto-Celtic
*rīxs
(derived(cel-gau/la))