Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Breton
daou
←
Proto-Brythonic
*dọw
(inherited)
←
Proto-Celtic
*dwau
(inherited)
←
Proto-Indo-European
*dwóh₁
(inherited)
→
Breton
daouzek
(compound)
→
Breton
daou-ugent
(compound)