Nimet Eloui Bey was a famous Egyptian model in the 1920s and 1930s, whom I'm researching at the moment. Although now largely forgotten, she is still mentioned from time to time due to being the first wife of Aziz Eloui Bey, who divorced her in order to marry Lee Miller, after which she drank herself to death in a few weeks.
Ralph Freedman stated in his biography of Rainer Maria Rilke (this is a link to the passage in question) that she was the daughter of a 'First Chamberlain to Sultan Hussein of Egypt'. I presume that 'Sultan Hussein' refers to Hussein Kamel; in that case, it shouldn't be too much labour to identify one of his chief ministers, since he reigned for less than three years (1914-1917). However, Googling "Hussein Kamel", "Sultanate of Egypt" and "First Chamberlain", and various permutations thereof, is not giving me anything useful.
An ambitious tangent: if anyone could give me a date of birth, even an approximate one, for Madame Eloui Bey, that would be marvellous. According to this article, she was born in Cairo, but it doesn't say when.