This amnesic believes his name is Benjaman with an a. He chose Kyle for a surname because he was found by a Burger King & the initials "BK" stuck.
The common conception is that his loss of memory is a tragedy, but let's think of the benefits. He can be whoever he wants to be. Furthermore, he can imagine himself to have been whoever he wants himself to have been. He has cast off the shackles of the past.
But the moral of the story is that it doesn't matter who he is or who he was. He is content with his life. Best of all, people care for him, despite lacking any facts about his background. All they know is he's a fellow human being, & that's reason enough to care.