Koi language

Koyee (कोयी) is a Sino-Tibetan language belonging to the Kiranti languages spoken in the Khotang district of Nepal. Like other Kiranti languages, it displays a fairly complex system of person-marking and stem alternations. The term "Koyee" has dual significance, describing both a language and a tribe. Its origins trace back to various sources. According to records from 2015 BS, the term could have been derived from "kuyama" (IPA- kujämä), words in the Koyee language that mean "dark." This might be connected to the location of Sungdel on the hill 'Lourya,' which seems to be dark. The people residing in this shadowy area came to be known as the Koyee tribe, and the language they spoke became known as Koyee language. Over time, phonological changes, such as the shift from "u" to "o(backness)" have contributed to the evolution of the term. Koyee people who settle down in easter side of Nepal are known as Koyu (कोयू).

Alternate spellings and names are Kohi, Koi B.ʌʔ’, Koyee, Koyi, Koyu.

Geographical distribution
Koyee is spoken in Sungdel (near Rawakhola headwaters) and Dipsung VDC's, northeastern Khotang District, Koshi Province, Nepal (Ethnologue).

Vowels

 * While using Devanagari script long vowel is denoted by using /ः/ instead of using long diacritics (दीर्घ मात्रा)and to denote nasal sound / ँ/ is used.

Consonants

 * Glotta stop is one of the consonants of Koyu/Koyee(Koi) language which is represent by using $⟨इ⟩$.
 * To write Koyu/Koyee language Devanagari lipi or Kirat Sirijunga lipi is used.