Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Norse
gjarn
←
Proto-Germanic
*gernaz
(inherited)
←
Proto-Indo-European
*ǵʰer-
(root)
←
Proto-Indo-European
*ǵʰer-
(derived)
→
Westrobothnian
gjer
(mention)
→
Icelandic
gjarn
(inherited)
→
Old Norse
gjarna
(cognate)