Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Saxon
arn
←
Old English
earn
(mention)
←
Proto-Germanic
*arô
(inherited)
←
Old Norse
ǫrn
(mention)
→
Old Norse
ǫrn
(mention)