The rapper's original name is William James Adams, but he changed his catchy moniker after embarking on a hip-hop career.
In a recent interview, he revealed he got "hostile" when airport security didn't understand that his name was no longer Williams Adams, saying, "Not even my family call me William. And only government officials or border guards ever give it to me with the full Mr William Adams. But that's not me. It might say that on the paperwork but that ain't me. I'm will.i.am. If anyone says different, then I can get quite hostile."