Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Church Slavonic
осмь
←
Proto-Indo-European
*oḱtṓw
(derived)
←
Proto-Slavic
*osmь
(inherited)
→
Old English
eahta
(cognate)
→
Lithuanian
aštuoni
(cognate)
→
Latvian
astoņi
(cognate)