Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Polish
sok
←
Proto-Indo-European
*sokʷós
(inherited)
←
Proto-Indo-European
*sekʷ-
(mention)
←
Proto-Slavic
*sokъ
(inherited)