Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Cornish
kara
←
Breton
karout
(cognate)
←
Proto-Brythonic
*karɨd
(inherited)
←
Welsh
caru
(cognate)
→
Breton
karout
(cognate)