Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Breton
Koulm
←
Latin
columba
(borrowed)
→
Breton
Koulma
(suffix)
→
Breton
Koulmez
(suffix)
→
Breton
Koulmenn
(suffix)
→
Breton
Koulmig
(suffix)
→
Breton
Koulman
(suffix)
→
French
Coulm
(borrowed)