Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Japanese
シグマ
←
Greek
σίγμα
(borrowed)
←
English
sigma
(borrowed)
←
Ancient Greek
σῖγμᾰ
(derived)