Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Elfdalian
aðertǫ
←
Proto-Germanic
*ahtōutehun
(inherited)
←
Old Norse
átján
(inherited)
←
Swedish
aderton
(cognate)