Reason Jesus must have been a real person

[Fake Messiah]

So one question I have, is if Jesus was completely made up, why is his name "Jesus"?

Actually Jesus the risen and the one who brings forgiveness for all sins in a single day was nothing new to the Jews because there was already a character liked in the Bible that and also named Jesus. In the Book of Zechariah there is already Jesus ben Jehozadak, the legendary first high priest of the second temple. In Zechariah 6:11-13 Lord commands Zechariah to place the crown of kingship upon Jesus, for he will rise up from his place and build the House of the Lord. Earlier, this same Jesus is given authority over the temple; brings forgiveness for all sins in a single day; and in both passages is called a high priest. So there you go: name for a messianic figure, the name "Jesus ben Jehozadak" is also remarkably suitable. As it happens, in Hebrew the name Jehozadak/Yehozadak means "Jehovah the Righteous," so one could also read this as "Jesus, the son of Jehovah the Righteous." If you are searching the scriptures for hidden messianic hints (as many first century Jews were) it doesn't take much of a leap to turn this figure into a "Jesus, the son of God." Indeed, it's tailor-made for the job.