Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Proto-Germanic
*lugnijaz
→
Faroese
logn
(inherited)
→
Icelandic
logn
(inherited)
→
Icelandic
lygn
(derived)
→
Old Norse
logn
(inherited)