Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Breton
ruz
←
Proto-Brythonic
*rrʉð
(inherited)
←
Proto-Celtic
*roudos
(inherited)
←
Proto-Indo-European
*h₁rewdʰ-
(inherited)