Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Breton
Kernev
←
Proto-Brythonic
*Kernɨw
(inherited)
←
Welsh
Cernyw
(cognate)
←
Cornish
Kernow
(cognate)
←
Middle Breton
Querneau
(inherited)
→
Breton
kerneveg
(suffix)
→
Breton
Kernevad
(suffix)
→
Welsh
Cernyw
(cognate)
→
Cornish
Kernow
(cognate)