Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Irish
ingreimm
←
Proto-Celtic
*eni-
(derived)
←
Proto-Celtic
*grindeti
(mention)
←
Proto-Celtic
*-man
(mention)