For close family and friends, you can with your first name or a nickname.
Answer:
SORRY I DON'T KNOWN....
Decipher means translate from code, or more generally, figure out. If you can't decipher your teacher's writing, it means you can't read it. You might feel like you're being asked to decipher a code. During World War II, the Nazis used a machine called the Enigma to encode secret messages.
