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