Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Irish
nigid
←
Proto-Celtic
*nigyeti
(inherited)
←
Proto-Indo-European
*neygʷ-
(derived)
→
Manx
niee
(derived)