Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Cornish
owr
←
Breton
aour
(cognate)
←
Welsh
awr
(cognate)
←
Welsh
aur
(mention)
←
Latin
aurum
(borrowed)
→
Welsh
owra
(affix)
→
Cornish
owrek
(compound)
→
Cornish
owryek
(compound)
→
Cornish
owraval
(affix)