וַתֹּ֣אמֶר אֲלֵיהֶ֔ן אַל־תִּקְרֶ֥אנָה לִ֖י נָעֳמִ֑י קְרֶ֤אןָ לִי֙ מָרָ֔א כִּי־הֵמַ֥ר שַׁדַּ֛י לִ֖י מְאֹֽד׃
나오미가 그들에게 이르되 나를 나오미라 칭하지 말고 마라라 칭하라 이는 전능자가 나를 심히 괴롭게 하셨음이니라
Ralbag Ruth
"Call me Mara, for the Almighty has made my life very bitter. The pleasantness of bitterness is the reversal of bitterness, just as sweetness transforms, for pleasantness can be said about sweetness, as it is stated (Proverbs 9:17): 'Stolen waters are sweet, and bread eaten in secret is pleasant.'"
Ibn Ezra
"Call me not Naomi, call me Mara." Even though it is written with an 'aleph', it comes as in the way of the 'heh' that disappears at the end of an 'aleph'. 'Mara' instead of 'ha'. Similar to 'as a young calf' according to Rabbi Judah's opinion. In my view, 'Naomi' means something delightful, and 'Mara' is the opposite of delight, and the delightful thing is the sweet food.