Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Latin
Carnutes
←
Gaulish
*carn
(mention)
←
Gaulish
*auten
(mention)
←
Proto-Celtic
*karnos
(derived)
←
Welsh
carn
(cognate)
←
Proto-Indo-European
*ḱerh₂-
(derived)