Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
iâ
←
Proto-Brythonic
*jaɣ
(inherited)
←
Proto-Celtic
*yegis
(inherited)
←
Proto-Indo-European
*h₁yeg-
(inherited)
→
Welsh
iäaidd
(suffix)
→
Welsh
hufen iâ
(compound)
→
Scottish Gaelic
eigh
(cognate)
→
Cornish
yey
(cognate)