ROGERS, George Gordon. 18?? — 1???. British Officer (?) in India. A younger Geogre Gordon Rogers served later on in Nepal, but he was born only in 1893 and his father was G. W. Rogers, Colonel og Gurkha Rifles (https://www.the-saleroom.com/en-us/auction-catalogues/dixnoonanwebb/catalogue-id-dix-no10014/lot-682b4fea-d5eb-445f-afdf-a54c00a72949). Probably our G.G.R. was of the same family.
Publications: Colloquial Nepali. 132 p. Calcutta 1890 and editions.
Sources: Work noted in L.S.I. and often in Internet, but nothing about the author.