Jun FAn or Jun Fan Gung Fu is a martial art that stems from Bruce Lee's modifications of Wing Chun Kung Fu. It was named after Bruce's Chinese given name (Lee Jun Fan) therefore literally translates as "Bruce Lee's Gung Fu."
The Seattle era of Jeet Kune Do is usually referred to as the Jun Fan Gung Fu era. The Jun Fan Gung Fu Institute, which was Lee's first official Martial Arts school in the US, still has a dedicated group of students to this day. It is run by Lee's most senior student (in Jun Fan Gung Fu, not Jeet Kune Do), and caretaker of his grave Taky Kimura.