Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Icelandic
þvengur
←
Proto-Germanic
*þwangiz
(inherited)
←
Old Norse
þvengr
(inherited)
→
English
thong
(cognate)