Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
cynuta
←
Welsh
cynnud
(affix)
←
Welsh
-a
(affix)
←
Cornish
keunyssa
(cognate)
→
Welsh
cynutai
(link)