This information was revealed through the semi-canonical Lost video game
Lost: Via Domus
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Characters:   Beady Eyes · Elliott Maslow · Lisa Gellhorn · Zoran Savo · Rico
Episodes: "Force Majeure" · "A New Day" · "Via Domus" · "Forty-Two" · "Hotel Persephone" · "Whatever It Takes" · "Worth A Thousand Words"

The Thai fisherman is a character in the storyline of the video game Lost: Via Domus. In the second flashback of the game, Lisa tricks the Thai fisherman and steals his boat. She lies to him, telling him a woman down the beach was in distress. ("A New Day")