Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Norse
-œnn
←
Proto-Germanic
*-ōnijaz
(inherited)
→
English
-ern
(cognate)
→
Old Norse
aldrœnn
(suffix)
→
Old Norse
norðrœnn
(suffix)