Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
cynhaeaf
←
Welsh
cyn-
(affix)
←
Welsh
gaeaf
(affix)
←
Cornish
kynnyav
(cognate)
→
Welsh
cynaeafu
(affix)
→
Cornish
kynnyav
(cognate)