Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
North Frisian
kuup
←
West Frisian
keap
(cognate)
←
Proto-West Germanic
*kaup
(inherited)
←
Old Frisian
kāp
(inherited)
→
German
Kauf
(cognate)