Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Irish
ág
←
Proto-Indo-European
*h₂eǵ-
(root)
←
Proto-Indo-European
*h₂eǵ-
(derived)
→
Irish
ágh
(inherited)
→
Irish
ághdha
(mention)
→
Scottish Gaelic
àigh
(mention)