Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Galician
Cadarnoxo
←
Proto-Celtic
*katarno-
(derived)
←
Proto-Celtic
*katus
(mention)
←
Welsh
cadarn
(cognate)
←
Proto-Indo-European
*kéh₃tus
(derived)
←
Middle Breton
cadarn
(cognate)