Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Norse
ǫrr
←
Proto-Germanic
*arwaz
(inherited)
→
Icelandic
ör
(derived)
→
Old Norse
ǫrleikr
(suffix)