Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
dar-
←
Proto-Celtic
*do-are-
(inherited)
←
Welsh
dy-
(compound)
←
Welsh
ar-
(compound)
←
Welsh
(compound)
→
Welsh
darlledu
(prefix)
→
Welsh
darlunio
(affix)
→
Welsh
darganfod
(affix)
→
Welsh
darlith
(affix)
→
Welsh
darlun
(affix)