[Jack takes a big breath and gathers strength for this. Beast Boy has been relatively nice, so he's earned some honesty.]

My passport is forged... It says Jack Wynand on it. But I used to be Subject WYK. [He thinks for a bit.] I like Jack. But my last name is really Ryan... I think. That's my... father's last name.

[He is so uncomfortable talking about this. A voice in his head keeps insisting people he knows are dead will kill him for saying so much.]