Where does “Паѵьлъ” come from?

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

Ancestry of “Паѵьлъ”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	Παῦλος	Paul, a common Roman name, famously held by Paul, the Christian apostle
2	Latin	paulus	little, small
3	Latin	paullus	—