Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Yiddish
העלפֿן
←
Proto-Germanic
*helpaną
(inherited)
←
Middle High German
hëlfen
(inherited)
←
Proto-West Germanic
*helpan
(inherited)
←
Old High German
helfan
(inherited)
→
Yiddish
העלפֿער
(suffix)