It is narrated from Sayyiduna Salman al-Farisi (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "I named the two of them" (meaning Sayyiduna Hasan and Sayyiduna Husayn (may Allah be pleased with them both)) "after the two sons of Harun (peace be upon him), Shabbar and Shubayr."
Hadith Referenceالمعجم الكبير للطبراني / باب السين / 6143