Bzuh?
Greek zeta, after being mangled through the Etruscan alphabet, possibly became the letter I in the Roman alphabet. They (the Romans) didn't borrow Y and Z until after the conquest of Greece, 146 BC. Not to mention that Greek didn't have any lowercase letters until after 300 BC; the Roman alphabet (including that capital I) existed at least as early as the founding of Rome, supposedly 753 BC.