Where does “Павьлъ” come from?

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

Ancestry of “Павьлъ”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	Παῦλος	—
2	Latin	paulus	little, small
3	Latin	paullus	—

Павьлъ — Etymology, Origin & Word History | Etymology Explorer