Why did Moshe keep his name if it was given by an Egyptian?

Question

In this weeks parsha it says (Shemos 2:10):

"וַיִגְדַּל הַיֶּלֶד וַתְּבִאֵהוּ לְבַת־פַּרְעֹה וַיְהִי־לָהּ לְבֵן וַתִּקְרָא שְׁמוֹ מֹשֶׁה וַתֹּאמֶר כִּי מִן־הַמַּיִם מְשִׁיתִהוּ׃"

“When the child grew up, she brought him to Pharaoh’s daughter, who made him her son. She named him Moses, explaining, I drew him out of the water.”

Later on and for the rest of history, everyone calls him by the name Moshe, even G-d! Why would Moshe keep this name if it was given to him by an Egyptian, not his mother nor was it given by G-d?

Answer 1

The Midrash Rabba in place says:

"אָמַר לוֹ הַקָּדוֹשׁ בָּרוּךְ הוּא לְמשֶׁה חַיֶּיךָ מִכָּל שֵׁמוֹת שֶׁנִּקְרְאוּ לְךָ אֵינִי קוֹרֵא אוֹתְךָ אֶלָּא בַּשֵּׁם שֶׁקְּרָאַתְךָ בִּתְיָה בַת פַּרְעֹה (שמות ב, י): וַתִּקְרָא שְׁמוֹ משֶׁה, וַיִּקְרָא אֶל משֶׁה."

As Batya converted and called herself a Hebrew name - בת-יה (G-d's daughter) she also prophecized Moses' name (ברוח הקודש אמרה) and G-d agreed to use that name exclusively.

NB, as for the name itself, the other Midrash in place says that the name was used exclusively as it is a reminder (and an opposition/reaction to) for Pharaoh drowning of the Jewish children in Nile.

Answer 2

According to Ibn Ezra there, Moshe was the Hebrew translation to the Egyptian name "Monios". He says that he learned this from ancient Egyptian texts and Greek books. He suggest that perhaps Bas Pharaoh learned Hebrew, or maybe she asked a Hebrew for the proper translation. Following this logic, it seems that Pharaoh, other Egyptians, etc. would call him Monios and only Basyah (Bas Pharaoh), other Hebrews, and G-d knew him as Moshe.

Moshe had other names as well, given to him by different people. According to R' Meir, Yocheved named him Tuvia (Sotah 12a). Citing the Gemara (Megillah 13a), Yalkut Shimoni (166) says that Moshe was given a name by each of his family members for different reasons. He was called "Yered" by Miriam, "Chever" by Amram, "Yekusiel" by Yocheved, "Shemaiah" by the Jewish people, "Avi Zenuach" by Aharon, "Avi Socho" by his nursemaid, and "Avi Gedor" by Kehas ben Levi. He was also known as "Ben Nesanel" and "Aviasar". See there and the original Gemara.