Where does “icchā” come from?

icchā (Pali) comes from Sanskrit इच्छा, from Sanskrit -आ, from Proto-Indo-European -éh₂.

Ancestry of “icchā”, step by step

Step	Language	Word	Meaning
1	Sanskrit	इच्छा	wish, desire, inclination; a question or a...
2	Sanskrit	-आ	feminine suffix
3	Proto-Indo-European	-éh₂	—

icchā — Etymology, Origin & Word History | Etymology Explorer