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)