Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old English
āþ
→
English
oath
(inherited)
→
Old English
friþaþ
(compound)
→
Old English
manaþ
(compound)
→
Old Norse
eiðr
(cognate)