"Are there any meforshim who see the ehyeh in 3:12 as the name?"
Rashbam and Abarbanel. ( This comes from the commentary in the Gutnick Chumash pages 356-357)
Also, in 3:15, L'olam is missing a vav. This implies that the name ehyey is a concealed name. ( This comes from the English translation of Mikraos Gidolos, Judaica press, The footnote cites ...
This subject is discussed by many meforshim, particularly within Chassidut.
The first name pertains to the final redemption (which is why it is being utilized to address Moshe in the first redemption) and also precedes creation (meaning before the Kav enters the Makom Panoy and what follows afterward).
Regarding your observation that in Shemot 3:12 this ...
Or HaChaim on Shemot 3:14 makes this point:
ושם זה כבר רמזו אל עליון בנועם דבריו באמור לו כי אהיה עמך
The Supernal G-d had already hinted at this Name with His pleasant words when He said to him, "For E-hyeh is with you".
A possible explanation:
End of Pasuk 20 and beginning of Pasuk 21 is:
...וַיִּקַּ֥ח משֶׁ֛ה אֶת־מַטֵּ֥ה הָֽאֱלֹהִ֖ים בְּיָדֽוֹ: וַיֹּ֣אמֶר יְהֹוָה֘ אֶל־משֶׁה֒ בְּלֶכְתְּךָ֙ לָשׁ֣וּב מִצְרַ֔יְמָה...
and Rashi explains on the words בְּלֶכְתְּךָ֙ לָשׁ֣וּב מִצְרַ֔יְמָה as follows:
דע שעל מנת כן תלך, שתהא גבור בשליחותי לעשות כל מופתי לפני פרעה ולא
Because she was a truth seeker who was no longer interested in idol worship.
The Gemorah in Sotah 12B says:
ותרד בת פרעה לרחוץ על היאור א"ר יוחנן משום ר' שמעון בן יוחי מלמד שירדה לרחוץ מגלולי אביה
“And the daughter of Pharaoh came down to bathe [lircḥotz] in the river” Rabbi Yoḥanan says in the name of Rabbi Shimon ben Yoḥai: This teaches that she came ...
Some midrashim often fill in the names of minor characters. One prominent example is Sefer Hayashar. Thus, all the names of the wives of Yaakov's sons are listed in chapter 45:
And so in many other places. However, in the case of Tzippora's sisters, Sefer Hayashar, chapter 76 does not list it. Rather, verse 14 just describes them as the seven daughters of ...