Where does “Пасха” come from?

Пасха (Russian) comes from Russian Па́сха, from Ancient Greek Πάσχα, from Aramaic פסחא, from Hebrew פֶּסַח — Passover.

Ancestry of “Пасха”, step by step

Step	Language	Word	Meaning
1	Russian	Па́сха	Easter
2	Ancient Greek	Πάσχα	Easter
3	Aramaic	פסחא	—
4	Hebrew	פֶּסַח	Passover