कपिश्चासाविन्द्रश्चेति कपिर्वराहः, वाराहं वपुरास्थितः कपीन्द्रः; कपीनां वानराणामिन्द्रः कपीन्द्रः राघवो वा ।भूरयो बह्व्यः यज्ञदक्षिणाः धर्ममर्यादां दर्शयतो यज्ञं कुर्वतो विद्यन्त इति भूरिदक्षिणः ॥
In plain words
"He is kapi, and that same one is indra" — that is how the name Kapīndra is built. Kapi means the boar: the One who took on the boar's body is Kapīndra. Or read it the other way — indra, lord, of the kapis, of the monkeys: Kapīndra is Rāma of Raghu's line. Bhūri means abundant, many: the gifts He hands out at the sacrifice are many, for He performs sacrifice and in doing so shows everyone where the bounds of dharma lie. That is why He is called Bhūridakṣiṇa.
Close to the Sanskrit
"He is kapi and he is indra" — thus [Kapīndra]. Kapi is the boar; He who has assumed the boar-body is Kapīndra. Or: the indra, the lord, of the kapis, that is, of the monkeys, is Kapīndra — Rāghava. Abundant, that is, many, are the sacrificial gifts that belong to Him who, showing the bounds of dharma, performs sacrifice; thus, Bhūridakṣiṇa.