Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Greek
εσύ
←
Ancient Greek
σύ
(inherited)
←
Proto-Indo-European
*túh₂
(inherited)
→
English
thou
(cognate)
→
Pontic Greek
εσύ
(link)
→
Tsakonian
εκιού
(cognate)