Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Cornish
yey
←
Proto-Brythonic
*jaɣ
(inherited)
←
Welsh
iâ
(cognate)
←
Irish
oighear
(cognate)
←
Scottish Gaelic
eigh
(cognate)
→
Scottish Gaelic
eigh
(cognate)