Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
dadl
←
Proto-Brythonic
*dadl
(inherited)
←
Proto-Celtic
*datlā
(inherited)
←
Irish
dáil
(cognate)
←
Proto-Indo-European
*dʰeh₁-
(root)
→
Welsh
dadlau
(mention)
→
Welsh
cynhadledd
(affix)