Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Irish
snigid
←
Proto-Celtic
*snigʷyeti
(inherited)
←
Proto-Indo-European
*sneygʷʰ-
(derived)
→
Irish
snigh
(inherited)