The writers said they intended it to be Jonathan Archer. Is that canon? Nope, but neither is the concept of his decedents. I doubt canon will ever say one way or the other.
I say it's Archer. We all know who it was intended to be. The writers say outright who it's intended to be. Scott Bakula himself got the joke. Let's not let something so silly as real world life spans and Christopher's need for empirical evidence ruin the cute little Easter egg they planted there for us.