Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old English
cnæp
→
English
knap
(inherited)
→
English
nep
(mention)
→
Middle English
knap
(inherited)
→
Middle English
knappe
(inherited)
→
Irish
cnaipe
(derived)
→
Irish
cnap
(derived)