In terms of my own family connection, what I did discover--and I had no idea until I was deeply immersed in this, because I came from a very strong Irish traditional family and I didn’t pay a lot of attention to the fact that I have French blood on one side--but, I discovered that my grandmother’s maiden name, Pascal, which is also the name that I use for my character, has a very fascinating family connection to the bloodline.
[I]t’s not a question of, "Oh, I have a genealogy that dates back to Jesus." Such a thing never exists. It’s impossible to do that because those kinds of records weren’t kept in the early part of our history.Unfortunately, she wasn't able to turn up Jesus' last name, which would have made things much easier. (In case you're wondering, "Christ" doesn't count.)
Anyone who says that they can definitively prove their genealogy back to this lineage is lying. It can’t be done. But, what we can do is we can say, we know that these family names have had associations for hundreds or even more years and that’s a starting point. [Link]