ANSWER 01: Esther's real name
Since the Jews went into their first exile it has been the custom to give a newborn baby boy or girl born outside of Israel, a ‘local Gentile’ name at birth. Then the babies are given their Hebrew names on the eighth day, the boys at their Briet (circumcision). So, Esther (which is unfortunately a derivative of the fertility goddess Ishtar) was given to the baby girl at birth. Eight days later she was given her Hebrew name of Hadassah which means ‘Myrtle’. The Gentile name is used to keep the child from attracting unwanted attention. Note what the Bible says along this line.
Esther 2:10
“Esther had not revealed her people or family, for Mordecai had charged her not to reveal it.” NKJ
If Esther had gone by her Hebrew name Hadassah, her Jewish ethnicity would have been evident. We have a similar duel name in the Briet Hadashah (New Testament). There was a baby Jewish boy born in Tarshish. He was given his local Gentile name Paul, to which was attached his Roman citizenship, at birth. When he was eight days old he was circumcised and given his covenant name of Saul. Many Gentiles, who are unaware of this Jewish custom, think that when Saul was ‘saved’ his name was changed to Paul. However he is still called Saul in Acts chapters 9, 11, &12 many years AFTER his meeting with the LORD on the way to Damascus. 