Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Breton
gwaz
←
Breton
paotr
(link)
←
Proto-Celtic
*gezdā
(inherited)
←
Proto-Celtic
*wastos
(inherited)
←
Welsh
gŵydd
(cognate)
←
Welsh
gwas
(cognate)
←
Irish
gé
(cognate)
←
Cornish
godh
(cognate)
←
Middle Irish
géd
(cognate)
←
Middle Breton
goaz
(inherited)
←
Middle Breton
goas
(inherited)
→
Welsh
gwas
(cognate)
→
Welsh
gŵydd
(cognate)
→
Irish
gé
(cognate)
→
Cumbric
gos
(cognate)