Following consultation with police in the Surat Thani region, the Swedish consulate general was informed that the victims were in fact Swiss.
Four Swedish tourists were originally thought to have been among the victims after a flash flood resulted in the deaths of eight people in a cave in southern Thailand, Reuters reported.
Thai authorities said that a local tour guide, a boatman and six tourists all died after they were trapped inside the cave in the Khao Sok national park.
Police told Reuters that the dead also included a 10-year-old German boy.
According to the Bangkok Post, the group had taken a boat ride from the Ratchaprapha dam when heavy rainfalls flooded the cave.