Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Galician
cómaro
←
Proto-Celtic
*kom
(derived)
←
Proto-Celtic
*aro-
(derived)
←
Proto-Indo-European
*h₂erh₃-
(derived)
←
Old Irish
comar
(cognate)