en_tn_lite_do_not_use/rom/16/23.md

Gaius ... Erastus ... Quartus

These are men's names. (See: rc://en/ta/man/jit/translate-names)

the host

This refers to Gaius, the person in whose house Paul and his fellow believers gathered for worship.

the treasurer

This is a person who takes care of the money for a group.