Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Middle High German
sū
→
German
Sau
(inherited)
→
Alemannic German
Sou
(inherited)
→
Alemannic German
Suu
(inherited)
→
Luxembourgish
Sau
(inherited)