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