Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Proto-West Germanic
*ait(t)r
→
English
atter
(inherited)
→
German
Eiter
(inherited)
→
Saterland Frisian
Atter
(inherited)