Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Frisian
gast
←
Old English
gāst
(cognate)
←
Proto-West Germanic
*gaist
(inherited)
←
Old Saxon
gēst
(cognate)