Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
French
vergne
←
Gaulish
*werna
(derived)
←
Proto-Celtic
*wernā
(derived)
←
Old Irish
fern
(cognate)
→
Breton
gwern
(cognate)
→
Cornish
gwern
(cognate)