Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Proto-Celtic
*uɸo
→
Irish
fé
(inherited)
→
Irish
faoi
(inherited)
→
Irish
fiafraigh
(mention)
→
Manx
fo
(inherited)
→
Old Irish
fo
(inherited)