Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Irish
uamhan
←
Breton
aon
(cognate)
←
Proto-Celtic
*ɸobnos
(inherited)
←
Welsh
ofn
(cognate)
←
Cornish
own
(cognate)
←
Old Irish
ómun
(inherited)