“Is he ashamed of his birth name ?”
Yeah, anyone who goes by a nickname they’ve had most of their life is ashamed of their birth name. You’re reaching just a bit, don’t you think?
Reaching? That’s all they do. It’s the only thing they CAN do.
All the rest of us common folk are now forced to use our full legal names for travel, identification, etc., but anyone can run for President using whatever name; it’s just entertainment ...