Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
gwau
←
Breton
gweañ
(cognate)
←
Proto-Celtic
*wegyeti
(inherited)
←
Cornish
gwia
(cognate)
→
Welsh
gwŷdd
(suffix)
→
Welsh
gweedig
(suffix)