Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Irish
tarsno
←
Proto-Celtic
*taras
(derived)
←
Proto-Indo-European
*terh₂-
(derived)
←
Old Irish
[[tar]], [[dar]]
(mention)
←
Old Irish
(mention)
←
Old Irish
(mention)
→
Irish
trasna
(inherited)
→
Middle Irish
tarsna
(inherited)