Gilligan is a character from the popular American television sitcom Gilligan's Island. The show ran for three seasons from 1964 to 1967, and Gilligan was played by actor Bob Denver.
According to CelebrityNetWorth.com, Bob Denver's net worth was $5 million at the time of his death in 2005. It's unclear how much of that was derived from Gilligan's Island, but given the show's enduring popularity, it's likely that a significant portion of his wealth came from the show.
In terms of the Gilligan character specifically, it's difficult to say how much he would be worth in today's dollars. However, given that the show was a major hit in its day and remains popular today, it's safe to say that Gilligan would be worth a significant amount of money if he were real.