Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Breton
Leon
→
English
Dillon
(derived)
→
Breton
Leonad
(suffix)
→
Breton
leonek
(suffix)
→
Breton
leoneg
(suffix)
→
French
Léon
(mention)