Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Elfdalian
aintja
←
Proto-Germanic
*ainakjǭ
(inherited)
←
Old Norse
ekkja
(inherited)
←
Old Norse
ænkia
(mention)
←
Swedish
änka
(cognate)
→
Westrobothnian
aaintj
(cognate)