Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Proto-Celtic
*ɸerkos
→
English
Erc
(derived)
→
Welsh
erch
(derived)
→
Ancient Greek
πέρκη
(cognate)