Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Saxon
-o
←
Old English
-a
(cognate)
←
Old English
ǣta
(mention)
←
Proto-Germanic
*-ô
(inherited)
←
Proto-Germanic
*-ô
(inherited)
←
Gothic
-𐌰
(cognate)
←
Gothic
𐌽𐌿𐍄𐌰
(mention)
→
Old Saxon
gerno
(affix)