Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Breton
gwiñver
←
Proto-Celtic
*wiweros
(inherited)
←
Welsh
gwiwer
(cognate)
→
Welsh
gwiwer
(cognate)
→
Irish
iora
(cognate)
→
Scottish Gaelic
feòrag
(cognate)