Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
heno
←
Breton
henoazh
(cognate)
←
Proto-Brythonic
*hanoɨθ
(inherited)
←
Proto-Celtic
[[*sindos|*sindai]] [[*noxs|noxtē]]
(inherited)
←
Cornish
haneth
(cognate)
←
Old Welsh
henoid
(inherited)
←
Old Irish
innocht
(cognate)
→
Welsh
trannoeth
(mention)