Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Latin
valet
←
Gaulish
*wassos
(derived(la/en))
←
Gaulish
*wassos
(derived(la/fr))
←
Proto-Celtic
*wastos
(derived(la/en))
←
Proto-Celtic
*wastos
(derived(la/fr))