Of uncertain origin; Mnason, a Christian -- Mnason.
Thayer's Greek Lexicon
Strong's 3416: Μνάσων
Μνάσων, Μνασωνος, ὁ (ΜΝΑΩ), Mnason, a Christian of Cyprus: Acts 21:16. (The name was common also among the Greeks; (cf. Benseler's Pape's Eigennamen, under the word).)
Acts 21:16 - N-DMS GRK:ᾧ ξενισθῶμεν Μνάσωνί τινι Κυπρίῳ NAS: with us, taking us to Mnason of Cyprus, KJV: with them one Mnason of Cyprus, an old INT: whom we might lodge Mnason a certain a Cypriot