Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
Gwilym
←
Proto-Germanic
*Wiljahelmaz
(derived)
←
Proto-Germanic
*wiljô
(mention)
←
Proto-Germanic
*helmaz
(mention)
←
Old High German
Willahelm
(derived)