Eight days after his birth, the Son of God was named Jesus.

 

In ancient Israel it was required by law that eight days after a boy was born, his parets would name him and circumsise him. Joseph and Mary followed the law and circumsised Him and named Him Jesus, as an angel had told them to, eight days after His birth.

 

''And when eight days were accomplished for the circumcising of the child, his name was called Jesus, which was so named of the angel before he was conceived in the womb.'' - Luke 2:21 (KJV)

 

Jesus of Nazareth was his name. Back, in ancient Israel it was common to include the native area in ones name. Although He was born in Bethlehem, his 'hometown' was Nazareth.

The Bible mentions people whos names include their native area quite often. One example is Simon of Cyrene (Luke 23:26). 

 

Christians call Him Jesus Christ most of the time, because we believe he is the Messiah. 

Christ comes from the ancient greek word 'khristos' and simply can be translated into the hebrew as 'mashiach' or 'Messiah'. 

If you read the Old Testament you'll find the title 'Messiah', for it was written in hebrew and if you read the New Testament you'll find the title 'Jesus Christ' or 'The Christ', for it was written in ancient greek.