Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Proto-Celtic
*eɸirom
→
Irish
ar
(inherited)
→
Irish
iarr
(derived)
→
Irish
fiafraigh
(derived)
→
Old Irish
íar
(inherited)