I don’t know if it’s an urban legend but I was told that the name “Gilligan” came from from Newton Minnow, the then Chair of the FCC who called TV back in 1961 a “vast wasteland”.
Is he who the SS Minnow was named after?
Ironic, isn't it? Minnow turned out to be right, as exemplified by the show using his name. Which I watched 5-10 times per episode, by the way, as it was on after school.