He's going to learn about Bin Laden in school. The kids will call him Bin Laden.
Yep. Bin Laden's name is irrevocably attached to 9/11. 9/11 explains a lot of the world's current political context so there's no doubt that kids are going to learn about it, and if they're learning about 9/11, they're going to hear the name Bin Laden.
Honestly though, I don't think the name is going to stick unless your kid looks Middle Eastern. If he does, he's going to become a target for sure.