Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Prussian
rikīs
←
English
rector
(cognate)
←
Proto-Indo-European
*reg-
(inherited)
←
Latin
rex
(cognate)
→
Lithuanian
rikis
(cognate)