Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Elfdalian
båkå
←
Proto-Germanic
*bakkōną
(derived)
←
Old Norse
baka
(derived)
→
Elfdalian
bakukall
(affix)