Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Cornish
Frynk
→
Cornish
frynkek
(suffix)
→
Cornish
Frynkek
(suffix)
→
Cornish
Frynkes
(suffix)