Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Middle Irish
Ériu
←
Proto-Celtic
*Φīweryū
(inherited)
←
Proto-Indo-European
*piHweryon-
(inherited)
←
Proto-Indo-European
*peyH-
(mention)
←
Old Irish
Ériu
(inherited)