Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Irish
soc
←
Proto-Celtic
*sukkos
(inherited)
←
Welsh
hwch
(cognate)
←
Proto-Indo-European
*suH-
(derived)
←
Middle Irish
socc
(inherited)