Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
Gorffennaf
←
Welsh
gorffen
(compound)
←
Welsh
haf
(compound)
←
Cornish
Gorefen
(cognate)
→
Cornish
Gorefen
(cognate)