Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Icelandic
einfaldur
←
Proto-Germanic
*ainafalþaz
(inherited)
←
Old Norse
einfaldr
(inherited)
→
English
onefold
(cognate)
→
Scots
aefauld
(cognate)