linguistic:translation
Etymology

The Native people of Borneo referred to their island as Pulu K'lemantang but not as an ethnic name, when the sixteenth century Portuguese explorer Jorge de Menezes made contact with the native which became the name for modern-day Indonesian Borneo. The term kelamantan is used in Sarawak to refer to a group of people who consume sago in the northern part of the island. According to Crowfurd, the word kelamantan is the name of a type of mango (Mangifera) so the island of Borneo is called a mango island by the native. But he adds that the word is fanciful and unpopular. The local mango, called klemantan, is still widely found in rural areas in Ketapang and surrounding areas of West Kalimantan.

Internationally it is known as Borneo, derived from European contact with the Brunei kingdom in the 16th century during the Age of Exploration. On a map from around 1601, Brunei city is referred to as Borneo, and the whole island is also labelled Borneo. The name Borneo may derive from the Sanskrit word váruṇa (वरुण), meaning either "water" or Varuna, the Hindu god of rain.

Another source said it was from the Sanskrit word Kalamanthana, meaning "burning weather" possibly to describe its hot and humid tropical weather. In Indianized malay era the name Kalamanthana was derived from Sanskrit terms kala (time or season) and manthana (churning, kindling or creating fire by friction), which possibly describes the heat of the weather.

In 977, Chinese records began to use the term Bo-ni to refer to Borneo. In 1225, it was also mentioned by the Chinese official Chau Ju-Kua (趙汝适). The Javanese manuscript Nagarakretagama, written by Majapahit court poet Mpu Prapanca in 1365, mentioned the island as Nusa Tanjungnagara, which means the island of the Tanjungpura Kingdom.