Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Proto-Celtic
*stlissus
→
Irish
slios
(inherited)
→
Middle Irish
slis
(inherited)
→
Old Irish
slis
(inherited)
→
Middle Welsh
ystlys
(inherited)