Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Cornish
kell
←
Breton
kell
(cognate)
←
Welsh
caill
(cognate)
←
Ancient Greek
κολεός
(derived)
←
Latin
cōleus
(borrowed)
←
Latin
cella
(derived)
←
Old Irish
cell
(cognate)
→
Breton
kell
(cognate)
→
Welsh
caill
(cognate)
→
Cornish
diwgell
(prefix)
→
Cornish
kellgowser
(compound)