An American called Ben? ・ ベンというアメリカ人？

I have managed to book plane tickets to go to Saitama (near Tokyo) for New Years. My brother is coming to Saitama with his girlfriend. I got an e-mail saying that it would be good if I was still in Saitama on January 2, since then some of his girlfriend's friends are coming over and they want to see some magic. It also said, "By the way, she has told them that you are an American magician named Ben." It did not say why she would do such a thing...

お正月に埼玉行きのチケット取れた。弟が彼女と一緒に埼玉に来るんだ。メールで、「1月2日に（彼女の）友達が来るので、マジック見せて欲しい」って。そして、「ちなみに、ヨーナスがベンというアメリカ人のマジシャンだと（弟の彼女が）言った」って。何で彼女さんがそういうことを言ったか、書いていなかったけど…謎。