Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Breton
evor
←
Proto-Celtic
*eburos
(inherited)
→
Old English
Eoforwic
(cognate)
→
Welsh
Efrog
(mention)