Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Breton
glan
←
Proto-Brythonic
*glan
(inherited)
←
Proto-Celtic
*glanos
(inherited)
←
Proto-Indo-European
*ǵʰelh₃-
(root)