Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Breton
trist
←
Welsh
trist
(cognate)
←
French
triste
(cognate)
←
Latin
trīstis
(derived)
→
Breton
tristidigezh
(suffix)