وَلَقَدْ نَجَّيْنَا بَنِي إِسْرَائِيلَ مِنَ الْعَذَابِ الْمُهِينِ مِنْ فِرْعَوْنَ
We indeed delivered the Children of Israel from humiliating torment, from Pharaoh.
In the commonly recited reading, min Firʿawna has a preposition followed by a genitive name. The source also records a reading reported from Ibn ʿAbbās that treats it interrogatively as man Firʿawnu: man with a fatḥa on the mīm and Firʿawnu in the nominative.
That interrogative is not a request for an unknown name: it amplifies the terror of Pharaoh's cruelty, an instance of tahwīl. The distinctive syntax of the reported reading must not be confused with the case and function of the common reading.