וַיִּרְא֣וּ בְנֵֽי־יִשְׂרָאֵ֗ל וַיֹּ֨אמְר֜וּ אִ֤ישׁ אֶל־אָחִיו֙ מָ֣ן ה֔וּא כִּ֛י לֹ֥א יָדְע֖וּ מַה־ה֑וּא וַיֹּ֤אמֶר מֹשֶׁה֙ אֲלֵהֶ֔ם ה֣וּא הַלֶּ֔חֶם אֲשֶׁ֨ר נָתַ֧ן יְהוָ֛ה לָכֶ֖ם לְאָכְלָֽה׃
이스라엘 자손이 보고 그것이 무엇인지 알지 못하여 서로 이르되 이것이 무엇이냐 하니 모세가 그들에게 이르되 이는 여호와께서 너희에게 주어 먹게 하신 양식이라
Rashi on Exodus
מן הוא means this is something prepared for food, as in (Daniel 1:5) “And the king appointed (וימן) for them,”.
Or HaChaim on Exodus
ויאמרו איש אל אחיו מן הוא, They said to one another it is manna, etc. We need to understand why this whole verse is necessary. Perhaps G'd caused them to say מן instead of מה, and this remained the name of this heavenly bread. This would correspond to a commentary on Psalms 46,9 in Berachot 7 where the word Shammot, desolation, is read instead as Shemot, names. According to the Talmud, G'd Himself named different phenomena in His world. The words כי לא ידעו, "for he (the people) did not know what it was," would be the reason why G'd had to supply the name. This may have been the reason the Israelites eventually lamented the nature of the manna. Perhaps the Israelites were very clever calling it מן as they realised (verse 31) that this word itself was something unusual and reflected the Spirit of G'd.
Rashbam on Exodus
ויאמרו איש אל אחיו מן הוא, seeing that they did not know what it was; this is also the interpretation offered by Dunash in a book called “answers of Dunash,’ aimed at the commentary of Menachem, arguing that the end of the verse proves that this must be the meaning.