The language called by Yankievich and Pallas as “Монгерейский is a Flores-Sumba-Hawu language spoken on Flores Island in Indonesia. The source of the forms (all numerals) from “Монгерейский” is William Marsden, who refers to the language as “Mongeraye” (see his “Remarks on the Sumatran Languages”, 1782). The designation “Makasae” on the website is wrong and needs to be changed.
Reference
Marsden, William. 1782. “Remarks on the Sumatran Languages by Mr. Marsden. In a letter to Sir Joseph Banks, Bart. President of the Royal Society. Read Febuary 22, 1781.” Archaeologia, or Miscellaneous tracts relating to antiquity published by the Society of Antiquaries of London, VI., pp, 154-158.