The island was probably first inhabited about 15 centuries ago, settled by fishermen from the Malay Peninsula and Southern China. Shown on Chinese maps dating back to 1687, under the name Pulo Cornam. The name Samui is mysterious in itself. Perhaps it is an extension of the name of one of the native trees, mui, or it is a corruption of the Chinese word Saboey, meaning "safe haven".
Until the late 20th century, Samui was an isolated self-sufficient community, having little connection with the mainland of Thailand. The island was even without roads until the early 1970's, and the 15km journey from one side of the island to the other involved a whole-day trek through the mountainous central, of which some small pockets remain.
The central part of the island is an (almost) uninhabitable mountain jungle (peak Khao Pom, 635m) and the various lowland areas are connected together by a single road.
In addition to the airport, several ferries connect the island with the mainland, including the car ferry from Don Sak to a pier in the west of the island, south of the main town Nathon.
The old capital of Nathon, on the southwest coast of the island, remains the major port for fishing and inter-island transportation. Nathon is the seat of the regional government, and the true commercial hub of the Samui locals. It has a charming pace, and is almost small enough to walk everywhere. The old Chinese shop houses along the middle street whisper of an exotic history.