Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Westrobothnian
dahn
←
Icelandic
þaðan
(cognate)
←
Old Norse
*þæðan
(inherited)
←
Old Norse
þær
(cognate)
←
Swedish
dädan
(cognate)