Where does “Cásc” come from?

Cásc (Old Irish) comes from Latin Pascha, from Ancient Greek Πάσχα, from Aramaic פסחא, from Hebrew פֶּסַח — Passover.

Ancestry of “Cásc”, step by step

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

Cásc — Etymology, Origin & Word History | Etymology Explorer