Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Cornish
on
←
Proto-Celtic
*ognos
(inherited)
←
Proto-Indo-European
*h₂egʷnós
(inherited)
→
Cornish
morladron
(suffix)