My friend Heidi had the following comments about the Grape-Nuts question, here are her findings:
Re: Grape-Nuts. I immediately thought that the little nuggets are reminiscent of the seeds in grapes, then I found this on Wikipedia, which is about as credible as I:
"Grape-Nuts is a breakfast cereal developed by C. W. Post in 1897. Post was a patient and later competitor of the 19th-century breakfast food innovator, Dr. John Harvey Kellogg. Despite its name, neither grapes nor nuts have ever been ingredients in the cereal. The cereal is actually made from wheat and barley. Mr. Post believed that sucrose (which he called "grape sugar") formed during the baking process. This, combined with the nutty flavor of the cereal, inspired its name. Another explanation originates from employees at Post, who claim that the cereal got its name due to the its resemblance to grape seeds, or grape 'nuts.'"
Continuing on Grape-Nuts, elsewhere I have read that the maltose in this product was once referred to as grape sugar (could be another query for this blog) and since the product had a nut-like texture and taste, it was dubbed grape-nuts.