Why do Christians ignore the fact that there are many people named Jesus?
We don’t ignore it. It’s actually of no consequence because there are many people named James, John, Peter, Andrew, etc. The important thing is that there is only one person known as Jesus Christ, because He’s the only Messiah - the only Savior. His name - Jesus Christ - is above every other name, and at that name, every knee will bow and every tongue will confess that Jesus (Christ) is Lord, to the glory of God the Father. This stuff isn’t hard. Stop complicating the issue. Of course, the reason people do this is to avoid getting to the heart of the matter, which is this: have I believed in and trusted in Jesus Christ for the forgiveness of my sins, so that I can be put in right-standing with God the Father? That’s the issue!