Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Breton
hañv
←
Proto-Brythonic
*haβ̃
(inherited)
←
Proto-Celtic
*samos
(inherited)
←
Proto-Indo-European
(derived)
←
Old Breton
ham
(inherited)
←
Middle Breton
haff
(inherited)
→
Breton
hañvoù
(suffix)