Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old English
ead
←
Proto-Germanic
*audaz
(inherited)
←
Proto-West Germanic
*aud
(inherited)
←
Old High German
ōt
(cognate)
←
Icelandic
auður
(cognate)
←
Old Norse
auðr
(cognate)
←
Old Saxon
ōd
(cognate)
→
English
Eda
(derived)
→
Old English
Eadgar
(compound)
→
Old English
Eadmund
(compound)