Boyd’s Bible Dictionary:
(of a city, polite). Greek form of the Latin Urbanus, a Christian disciple of Paul at Rome whom he salutes (Rom. 16:9). Urbanus in R. V.
Concise Bible Dictionary:
Christian at Rome, described by Paul as “our helper in Christ,” to whom a salutation was sent (Rom. 16:9).
Jackson’s Dictionary of Scripture Proper Names:
of the city (Latin): end of the way (Greek) : This should be Urban, vid Trench, "On the Authorized Version" etc. Urbanus in Revised Version.