Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Proto-Celtic
*skētos
→
Breton
skoed
(inherited)
→
Irish
sciath
(inherited)
→
Scottish Gaelic
sgiath
(inherited)
→
Manx
skian
(derived)
→
Old Irish
scíath
(inherited)