Close Encounters Of The Third Kind: Lacombe is the name of one of the French crew members that are stranded on the island with Danielle Rousseau. Lacombe is also the name of the main French investigator in Close Encounters as played by François Truffaut. That Lacombe, from Close Encounters, is based on real life UFO investigator Jacques Vallée, who has theorized that UFO encounters might be interdimensional rather than extraterrestrial.
Source: Lostpedia