Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Breton
enez
←
Proto-Brythonic
*ɨnɨs
(inherited)
←
Proto-Celtic
*enistī
(inherited)
→
Breton
enezad
(suffix)
→
Breton
enezour
(suffix)
→
Latin
insula
(cognate)