Keith Martin (1969 or 1970 – December 5, 2014), one of the world heaviest lived people, was famous for being at one point the UK’s heaviest man, weighing approximately 980 lbs at his peak. Keith Martin was given a gastric bypass operation by the NHS, and had lost over 50% of his body weight.
Keith's last name is also a common first name.
His last name is "Martin", which is commonly used as a first name. I think wordplay is the AI's weakness, since it presumably doesn't have the breadth of knowledge humans do to be able to easily see words from different angles.