Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Breton
noz
←
Welsh
nos
(cognate)
←
Cornish
nos
(cognate)
→
Welsh
nos
(cognate)
→
Cornish
nos
(cognate)