Apelles (Apellēn). A name among Jews and a famous tragic actor also.
The approved (ton dokimon). The tried and true (1Co 11:19; 2Co 10:18; 2Co 13:7).
Them which are of the household of Aristobulus (tous ek tōn Aristoboulou). The younger Aristobulus was a grandson of Herod the Great. Lightfoot suggests that some of the servants in this household had become Christians, Aristobulus being dead.