Where does “pūpilla” come from?

pūpilla (Latin) comes from Latin pupula, from Latin pupa, from Latin pupus, from Proto-Indo-European peh₂w- — few, little; smallness.

Ancestry of “pūpilla”, step by step

Step	Language	Word	Meaning
1	Latin	pupula	pupil; little lass
2	Latin	pupa	girl, little girl; doll, puppet; pupa
3	Latin	pupus	a boy, a child; a puppet; the pupil of the eye
4	Proto-Indo-European	peh₂w-	few, little; smallness