E16 lists Ayi [ayx] as an unclassified Tibeto-Burman language of in the counties Fugong and Gongshan of Northwest Yunnan province, China. Some grammatical information is also given. The location and grammatical information matches Nung [nun] exactly, and apart from Nung there is no other non-Lisu language spoken at this location ( Hongkai Sun and Guangkun Liu 2009 ). Therefore the Ayi [ayx] entry is probably a duplication of the Nung [nun] entry. See also: Nung (Myanmar) [nun].
Retired in ISO 639-3: Merge into Anong [nun] as duplicate
Excerpt from change request document:
Apparently due to an error in reading Chinese linguistic sources (probably the Encyclopedic Dictionary of Chinese Linguistics) years ago, the name of a Nungish language spoken by some members of the Nu nationality group in China was mistakenly read as 阿依 ("Ayi" in Pinyin Romanization) rather than 阿侬 ("Anong") , and this was submitted to Ethnologue as "Ayi." Nu nationality intellectuals have confirmed that there are four languages spoken by members of this nationality group: Drung (which will probably need to be split into Drung and Anung/Along), Nusu, Rourou and Anong. There is no record of any language named "Ayi" spoken by members of the Nu nationality in Chinese literature or in the knowledge of local Nu intellectuals and therefore we conclude this is an error due to the similar appearance of the characters 侬 (nong) and 依 (yi).