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