† Assembly of Sikkim abolished monarchy and resolved to be a constituent unit of India. A referendum was held on these issues and majority of the voters voted yes. On 15 May 1975 the President of India ratified a constitutional amendment that made Sikkim the 22nd state of India.
The origin theory of the name Sikkim is that it is a combination of two Limbu words: su, which means "new", and khyim, which means "palace" or "house". The Tibetan name for Sikkim is Drenjong (Wylie-transliteration: ´bras ljongs), which means "valley of rice", while the Bhutias call it Beyul Demazong, which means '"the hidden valley of rice". According to the folklore, after establishing Rabdentse as his new capital Bhutia king Tensung Namgyal built a palace and asked his Limbu Queen to name it. The Lepcha people, the original inhabitants of Sikkim, called it Nye-mae-el, meaning "paradise". In historical Indian literature, Sikkim is known as Indrakil, the garden of the war godIndra.