From Dionusos (Bacchus); reveller; Dionysius, an Athenian -- Dionysius.
Thayer's Greek Lexicon
Strong's 1354: Διονύσιος
Διονύσιος, Διονψσιου, ὁ, Dionysius, an Athenian, a member of the Areopagus, converted to Christianity by Paul's instrumentality: Acts 17:34. (Cf. B. D., under the word.)
Acts 17:34 - N-NMS GRK:οἷς καὶ Διονύσιος ὁ Ἀρεοπαγίτης NAS: also were Dionysius the Areopagite KJV: the which [was] Dionysius the Areopagite, INT: whom also [was] Dionysius the Areopagite