Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Proto-Celtic
*brassos
→
Breton
bras
(inherited)
→
Breton
bras
(inherited(br/cy))
→
Irish
bras
(inherited)
→
Cornish
bras
(inherited)
→
Cornish
broas
(inherited)