Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Proto-Celtic
*kaɸrāxs
→
Welsh
caeriwrch
(derived)
→
Irish
caora
(inherited)
→
Scottish Gaelic
caora
(inherited)
→
Manx
keyrrey
(inherited)
→
Old Irish
cáera
(inherited)