What masks do we wear? What roles do we play? What self do we think we are? It is probably not the true Self. Coming out goes deep within.
I wonder if Silas/Silvanus could be Paul's nickname for his own alter ego, the "Saul" of his prior persecuting life, his shadow side, his human side, his "sinful" side, prior to perhaps taking a "new name" of Paul after his conversion experience.