Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Saterland Frisian
Stäf
←
English
staff
(cognate)
←
Proto-West Germanic
*stab
(inherited)
←
Old Frisian
staf
(inherited)
→
Saterland Frisian
Boukstäf
(affix)