Where does “паша” come from?

паша (Russian) comes from Russian Па́вел, from Old Church Slavonic Павьлъ, from Ancient Greek Παῦλος, from Latin paulus, from Latin paullus.

паша (Russian): pasha; present adverbial imperfective participle...

Definitions

Step	Language	Word	Meaning
1	Russian	Па́вел	Paul
2	Old Church Slavonic	Павьлъ	—
3	Ancient Greek	Παῦλος	—
4	Latin	paulus	little, small
5	Latin	paullus	—

паша — Etymology, Origin & Word History | Etymology Explorer