Apelles in Fausset's Bible Dictionary
A Christian saluted in Romans 16:10 as "approved in Christ." A
common Jewish name, probably not, as Origen thought, Apollos.
Said to have been afterward bishop of Smyrna.
Apelles in the Bible Encyclopedia - ISBE
a-pel'-ez (Apelles): A Christian at Rome to whom Paul sends
greetings (Rom 16:10). He is described by Paul as "the,
approved in Christ," i.e. "that approved Christian" (Denney).
In some way unknown to us Apelles had been tested and he had
proved faithful (compare Jas 1:12; 2 Tim 2:15). It is a common
name. Many commentators refer to Horace (Satires, i.5.100):
"Credat Judaeus Apella, non ego."