Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Irish
saíthar
←
Proto-Celtic
*saitrom
(inherited)
←
Proto-Indo-European
*sh₂ey-
(root)
←
Proto-Indo-European
(inherited)
←
Proto-Indo-European
*sh₂ey-
(suffix)
←
Proto-Indo-European
*trom
(suffix)
→
Irish
saothar
(inherited)
→
Scottish Gaelic
saothair
(inherited)