Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Irish
maraid
←
Proto-Celtic
*marati
(inherited)
←
Proto-Indo-European
*merh₂-
(derived)
→
Irish
mair
(inherited)
→
Scottish Gaelic
mair
(inherited)