Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Manx
kellagh
←
Proto-Celtic
*kalyākos
(inherited)
←
Proto-Indo-European
*kelh₁-
(root)
←
Proto-Indo-European
*kelh₁-
(derived)
←
Old Irish
cailech
(inherited)