Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Proto-Celtic
*knokkos
→
Breton
krec'h
(inherited)
→
Irish
cnoc
(inherited)
→
Scottish Gaelic
cnoc
(inherited)
→
Manx
cronk
(inherited)
→
Old Irish
cnocc
(inherited)