The name Ko Pha Ngan derives from the word "ngan", meaning "sand bar" in the southern dialect, for there are many sand bars offshore.
Ko Pha Ngan has been a longtime favorite of past kings of Thailand. Rama V, or Chulalongkorn, for example, visited Ko Pha Ngan 14 times during his reign.[citation needed]
The Bronze Drum of Dongson Culture (500–100 BCE) that was found on Ko Samui in 1977 is evidence that there were settlements of people on Ko Samui, Ko Pha Ngan, and their islets more than two thousand years ago. Some historians and archaeologists believe that the first group who migrated to Ko Pha Ngan were the Muslim sea gypsies (Pygmy, Semung, and Proto-Malay) who travelled by boat from the Malay Peninsula. Today there are few Muslim inhabitants.
Over the last century the island's population has steadily expanded, first living off the sea and the land and farming coconuts. Later, tin mining became part of the economy. In the 1970s the mining industry faltered and finally petered out. Over the next decade tourism took hold. Now the island is primarily a tourist destination. Fishing and coconut farming remain important to the local economy.
Due to its topography, the population hugs the coastline. The mountainous interior is generally inaccessible. More than half the island designated as national park and Ko Pha Ngan has more than 80 km2 of relatively unspoiled rain forest with diverse flora and fauna. It is also considered a spiritual place, with numerous Buddhist temples around the island and a thriving spa, retreat, and meditation industry.