Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Irish
étiud
←
Proto-Celtic
*eni-
(derived)
←
Proto-Celtic
*togyātor
(mention)
←
Proto-Celtic
*-tus
(mention)
←
Proto-Indo-European
*(s)teg-
(root)
←
Proto-Indo-European
*(s)teg-
(derived)
→
Irish
éide
(inherited)