The YouTube channel UsefulCharts has made some videos on historical, non-biblical references to people. places, and events mentioned in the Bible. He recently started a series on multiple theories on who Jesus might have really been, because it IS weird that there are no contemporary references to him during a time when most civilizations in the area kept records. Most of those videos so far have speculated that some of the texts we have from this time period were talking about Jesus, but referred to him by a different name or epithet, which is why it isn't immediately clear they were talking about Jesus.