Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
casglu
←
Welsh
casgl
(affix)
←
Welsh
-u
(affix)
→
Breton
klask
(cognate)
→
Welsh
casgliad
(affix)