Named after my FJ40. It didn't have nickname for years (I bought it in 1999).
In 2003, we were running Spring Creek on the annual Father's Day run. One of Bill Morgan's passengers jumped in with me for the day. He was a high school kid, a wrestler IIRC (don't remember his name).
He knew Bill's truck was called "Red Chili" so he asked if my 40 had a nickname. I said no, but I wouldn't mind one. It was just that nothing I had thought of seemed right.
After running the rock garden, my passenger suggested "The Hulk," since my 40 was "green and mighty." The name stuck. There was a new Hulk movie in the theaters at the time, so Hulk awareness was high. Being a comic book fan back in the 70s, I was enthusiastic.