Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Cornish
porhel
←
Breton
porc'hell
(cognate)
←
Proto-Brythonic
*porxell
(inherited)
←
Middle Cornish
porhel
(inherited)
←
Welsh
porchell
(cognate)
←
Latin
porcus
(derived)
←
Old Cornish
porchel
(inherited)
→
Welsh
porchell
(mention)
→
Cornish
porhellik
(suffix)
→
Cornish
porhel dor
(affix)