Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
North Frisian
duuf
←
West Frisian
dôf
(cognate)
←
Proto-Germanic
*daubaz
(derived)
←
Old Frisian
dāf
(derived)