Frankly you first need to be frank with your audience members and let them know that you want them to think of a name, any name in the world. For instance, If you were to think of a famous celebrity you would want to think of a first name. For instance, Mr. Oz wouldn't due but you could use the Jim from Jim Henson. If it was the name of a famous frankfurter manufacturer you would want to use only the first name, say Oscar, not Meyer. If you were to think of the name of a famous movie character, such as the name of the man who uttered the famous words, " Frankly my dear I don't give a damn," you would use the name Rhett....not Butler.
.......or you could just sven deck your stack of business cards.