Where does “organista” come from?

organista (Medieval Latin) comes from Latin organum, from Ancient Greek ὄργανον, from Proto-Indo-European werǵ- — to make.

Ancestry of “organista”, step by step

Step	Language	Word	Meaning
1	Latin	organum	an implement, instrument, tool; any musical...
2	Ancient Greek	ὄργανον	instrument, implement, tool; sense organ; musical...
3	Proto-Indo-European	werǵ-	to make