Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Breton
gwalc'hiñ
→
Welsh
golchi
(cognate)
→
Irish
folc
(cognate)
→
Cornish
golhi
(cognate)