Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Breton
dañvad
←
Proto-Brythonic
*daβ̃ad
(inherited)
←
Proto-Celtic
*dametos
(inherited)
→
Breton
dañvadez
(suffix)