Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Middle Dutch
dertich
←
Proto-Germanic
*þrīz tigiwiz
(derived)
←
Old Dutch
*thrītig
(inherited)
→
Dutch
dertig
(inherited)
→
Zealandic
dertig
(inherited)