You even called it a “grim smile”, indicating he did not understand what was going on. In fact, when someone pauses before saying their name,people may think something is medically wrong with you, and it’s very common to “laugh” when nervous. Many grown ass SLP’s do not even recognize the signs of a Covert Stutter(which is likely what you have). You stutter in your name and words w similar beginning sounds bc you have grown to depend on word switching to prevent others from hearing possibly repetitions. Your name is one thing you cannot switch, so it becomes extra hard.