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Seder Hadoros mentions Avraham's mother, how old Nachor was when Sarah was born, and even a Peshat that Lot was her brother, though no mention of Sarah's mother's name. Any other sources that mention it?
As @Zvi mentioned it is mentioned in the Sefer למכסה עתיק (Rav Chaim Kanievski)that Sarah's name was Yiska Bas Tissa(not sure pronunciation).
This is the footnote 44:
4 years, 11 months ago
2 years, 6 months ago