Adam Clarke on Psalms 114:1

A people of strange language - This may mean no more than a barbarous people; a people whom they did not know, and who did not worship their God. But it is a fact that the language of the Egyptians in the time of Joseph was so different from that of the Hebrews that they could not understand each other. See Psa 81:5; Gen 42:23.

The Chaldee has here מעמי ברבראי meammey barbarey, which gives reason to believe that the word is Chaldee, or more properly Phoenician. See this word fully explained in the note on Act 28:2 (note). My old Psalter understood the word as referring to the religious state of the Egyptians: In gangyng of Isrel oute of Egipt, of the house of Jocob fra hethen folke.