וַיֹּ֧אמֶר מָנ֛וֹחַ אֶל־מַלְאַ֥ךְ יְהוָ֖ה מִ֣י שְׁמֶ֑ךָ כִּֽי־יָבֹ֥א דבריך [דְבָרְךָ֖] וְכִבַּדְנֽוּךָ׃
Lalu Manoah berkata kepada malaikat Yang Mahakekal: “Siapakah namamu? Sebab apabila perkataanmu itu terjadi, kami hendak menghormati engkau.”
Radak
וישתחו ארצה, they appeared to him to be men of great stature. He then addressed them with the words reported in the Torah. Our sages (Bereshit Rabbah 50,2) say that Avraham was so familiar with the sight of angels that their sudden appearance did not cause him to become disoriented, frightened and he perceived them essentially as אנשים, men. On the other hand, Lot, whose spiritual powers were quite minor, perceived the men as being angels, מלאכים, seeing that he had had little experience with such phenomena. (compare 19,1) Manoach’s wife had already told her husband that the face of the man who had told her that she would have a son was like that of an angel of G’d. (Judges 13,6)
Ibn Ezra
"Who are you, my daughter?" It is possible that she didn't see her until she opened the door for her to enter, as is customary. The scripture abbreviates it to say 'I am Ruth, your daughter'. Similar to 'they called him and he ate bread', and it's written 'and Moses agreed'. Rabbi Jonah the grammarian says, 'מי' means 'what', and the meaning is 'what happened to you'. He told me that it is similar to 'What is your name?' (Judges 13:17), because the use of 'מי' in such a context is not found with a human. In my opinion, 'שמך' (your name) is a proper noun, and therefore 'מי' relates to the context.
Chizkuni
למה זה תשאל לשמי, “why are you asking for my name?” The angel informs Yaakov that there is no point in knowing his name; he explains that when people that have not seen one another ever, upon meeting, will extend greetings with one another and bless each other wishing each other well, and ask one another for their names, they justify this in the event that they wished to communicate with each other in the future. If they do not know one another’s name and address, how could they communicate with each other? Knowing the angel’s name, just as in the case of Manoach in Judges 13,17, is important only when such occasions will arise. The angel assures Yaakov that in this instance there is no need for this as he knows his name and address and will not forget it. Another interpretation of why the angel retorted to Yaakov’s question with a question of his own, instead of with an answer, though he complied with Yaakov’s request to bless him: the reason why angels do not like to reveal their names is to prevent human beings to make them swear an oath concerning the mission that they had fulfilled. And we also found that it is also written about Manoach to whom the angel says, "Why do you ask for my name? And it is wonderful" (Judges 13,18). Another interpretation: I asked what is your name in order to mention it in the name of the act, but what will my name be of any use to you? Why would you ask me?