Apelles. Masculine. Only here. A Greek name frequently adopted by Jews.
approved = the approved, a term pointing to one of tried excellence. See Rom_14:18.
Aristobulus. Only here. A Greek name.
household. Literally those from among the (ones) of Aristobulus. He himself may not have been a Christian, and those referred to may have been of his family, or slaves. Compare Php_1:4, Php_1:22.