Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Proto-Celtic
*ɸorkos
→
Irish
arcán
(derived)
→
Manx
ark
(inherited)
→
Old Norse
Orkneyjar
(derived)
→
Old Irish
orc
(inherited)