Ramayana
भगीरथात्ककुत्स्थस्तु काकुत्स्था येन विश्रुताः । ककुत्स्थस्य च पुत्रोऽभूद्रघुर्येन च राघवाः ॥ २-११०-२७
To Bhagiratha was born Kakutstha, by whom your race is wellknown. A son Raghu was born to Kakutstha and hence all of you are known as Raghavas. ॥ 2-110-27॥
english translation
bhagIrathAtkakutsthastu kAkutsthA yena vizrutAH । kakutsthasya ca putro'bhUdraghuryena ca rAghavAH ॥ 2-110-27
hk transliteration by Sanscript