Ramayana
यस्माद्विश्रवसो ऽपत्यं सादृश्याद्विश्रवा इव । तस्माद्वैश्रवणो नाम भविष्यत्वेष विश्रुतः ॥ 7-3-8 ॥
"Since he is the offspring of Vishrava, and in likeness resembles Vishrava, therefore this renowned one shall be known by the name Vaishravana."
english translation