Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Proto-Celtic
*mezgos
→
Welsh
maidd
(derived)
→
French
mégot
(mention)
→
Irish
meadhg
(derived)
→
Old Irish
medc
(inherited)