Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Saxon
thū
→
Old English
þu
(cognate)
→
German
du
(cognate)
→
Middle Low German
du
(inherited)
→
Hunsrik
du
(cognate)
→
Old Frisian
thu
(cognate)