Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
West Frisian
ek
←
Proto-Germanic
*auk
(inherited)
←
Old Frisian
āk
(inherited)
→
English
eke
(cognate)
→
German
auch
(cognate)
→
Luxembourgish
och
(cognate)