Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Proto-Celtic
*sīlom
→
Welsh
hil
(inherited)
→
Irish
síol
(inherited)
→
Cornish
hil
(inherited)
→
Old Irish
síl
(inherited)