The angel asks this question as a rebuke. This question can be written as a statement. Alternate translation: "You should not ask me what my name is." (See: [[rc://en/ta/man/translate/figs-rquestion]])
It may be helpful to explain more explicitly why they should not ask his name. Alternate translation: "It is too wonderful for you to understand" (See: [[rc://en/ta/man/translate/figs-explicit]])