'Sylheti' (with the letters 'y' and 'h') like 'Bengali' (with the letter 'e') are both the British English spellings that have always existed in English since first colonial encounters. Most south Asian Indo-Aryan languages follow the [-i] ending. It is said as 'Hindi' language in Englsih, not 'Hind(i)ese' language. Please provide a references to where 'Sylhet(i)ese' is used in modern English.
It is current practice to borrow a word into a language like English without 'foreign' morphology, so to make the plural in English, the English plural [-s] is used, not the Siloti plural [-n]. It is 'octopus' - 'octopuses' in English.
However, translating the English term(s) into Sylheti (Siloti) language in parentheses after the English on the English language page, in various scripts with transriptions, as well as translations in Bangla to demonstrate the differences between Sylheti and Bangla, would be enriching additions.
195.195.176.198 (talk) 14:55, 1 February 2020 (UTC)
Not for language, for people it is mentioned as Sylhetis. In Sylheti Language it has singular Syloti and plural Sylotin.
Bengali only Sylheti.
English I suggested Sylhetese instead of "Sylhetis". Sylotin would be first recommendation, than Sylhetese or Sylheti accordingly in the page where it discuss about Sylheti People. (Hindi is artificially secret language made for Indian royals, none of Indian group of people use it to identify themselves linguistically like that, except some Arabic people call them Hindi)