Hermas is listed in Romans 16:14 and Clement in Philippians 4:3.
Greet Asyncritus, Phlegon, Hermes, Patrobas, Hermas, and the brothers who are with them.
Salute Asyncritus, Phlegon, Hermas, Patrobas, Hermes, and the brethren which are with them.
Scholars have pointed out that the Muratorian fragment says that Hermas wrote the Shepherd during the lifetime of bishop Pius
in the mid second century.
The Shepherd of Hermas was bound with the New Testament in the Codex Sinaiticus
and the Codex Claromontanus but was rejected by the later Catholic Church.
When it comes to several of Paul's other friends, like Asyncritus, Hermas, Julia, or Philologus to mention just a few, we know little more about them than their names.