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