Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Breton
lezverc'h
←
Breton
lez
(prefix)
←
Breton
merc'h
(prefix)
←
Welsh
llysferch
(cognate)