Where does “distiller” come from?

distiller (Old French) comes from Latin distillare, from Latin stilla — a drop; a drop, small quantity.

Ancestry of “distiller”, step by step

Step	Language	Word	Meaning
1	Latin	distillare	present active infinitive of distīllō;...
2	Latin	stilla	a drop; a drop, small quantity

distiller — Etymology, Origin & Word History | Etymology Explorer