Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Irish
sliasaid
←
Proto-Celtic
*slēxsantī
(inherited)
←
Old Irish
slíasait
(inherited)
←
Old Irish
slíassait
(mention)
←
Old Irish
slíasat
(mention)
→
Irish
leis
(link)