Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Breton
loen
←
Proto-Celtic
*lutno-
(inherited)
←
Welsh
llwdn
(cognate)
←
Middle Breton
lozn
(inherited)
→
Breton
loened
(suffix)
→
Welsh
llwdn
(cognate)