Verses Lv23-05b describing the Passover holiday states In the first month, on the fourteenth day of the month at dusk, is HaShem'S Passover. Rashi explains the name of the holiday, Passover by citing an other verse Ex12-12:13 which describes what God did on Passover: For I will go through the land of Egypt in that night, and will smite all the first-born in the land of Egypt, both man and beast; and against all the gods of Egypt I will execute judgments: I am HaShem. And the blood shall be to you for a token upon the houses where ye are; and when I see the blood, I will pass over you, and there shall no plague be upon you to destroy you, when I smite the land of Egypt. Hence the Rashi comment: The Passover holiday is so-named because God Pass-ed over the Jewish houses when killing the first born of Egypt.

Advanced Rashi: Interestingly, English has preserved this Passover - Pass-over distinction. The idea of explaining Rashi by similar connections in English was advocated in my article Peshat and Derah: A New Analytic Intuitive Approach