Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Saxon
eo
←
Proto-Germanic
*aiwaz
(inherited)
←
Old Norse
ei
(mention)
→
Old High German
io
(cognate)
→
Old Norse
æ
(cognate)
→
Old Saxon
neo
(prefix)