Apella (noun M) : * The name of a Roman freedman, Cic. Att. 12, 19; id. Fam. 7, 25; Planc. ap. Cic. Fam. 10, 17. * The name of a credulous Jew who lived in the time of Horace; hence, appellative for a credulous man, Hor. S. 1, 5, 100.
Charlton T. Lewis, Charles Short, A Latin Dictionary
PIR
Male Personal name Confirmed occurences in the Roman Empire:
Iulius Apella (Masc, senator), ref: PIR I 0155 | PIR ID7323