The rascal demons, they want to describe Kṛṣṇa in their own way so that Kṛṣṇa devotees may be unhappy, and that is their pleasure.
Therefore, to teach these rascals, Kuntī is pointing out, kṛṣṇāya vāsudevāya: (SB 1.8.21) "You rascal, you don't take Kṛṣṇa otherwise. I am speaking of Kṛṣṇa, the son of Vasudeva, Vāsudeva." Just like to identification in the court, if you give your name, then you must give the father's name, your village, your district, like that. That is identification. So therefore Kuntīdevī is pointing out: "It is no other Kṛṣṇa. The Kṛṣṇa whose father's name is Vasudeva, whose mother's name is Devakī, whose father's name is Nanda Mahārāja, whose mother's name is Yaśodāmāyi. That's all." When that Vallabha Ācārya... He wrote some essays and books, The Meaning of Kṛṣṇa. The Meaning of Kṛṣṇa. And he went to Caitanya Mahāprabhu, and he wanted some eulogization that he has so many meanings of Kṛṣṇa. So Caitanya Mahāprabhu said, "No, no, I know Kṛṣṇa's name, only two or three. That's all." He said, "I know Kṛṣṇa is the son of Yaśodāmāyi, Yaśodānandana. Kṛṣṇa means the boy who sucked the breast of mother Yaśodā. I know that."
So here also, nanda, nanda-nandanāya... He (she) says, nanda-gopa-kumārāya (SB 1.8.21). Kumāra. Kumāra means "who is not married." So Kṛṣṇa remained in Vṛndāvana up to sixteen years. Therefore He remained always kumāra, Nanda-kumāra, Nanda-nandana. Here it is explicitly said, Nanda-gopa. And who was Nanda? That is also explained. Nanda means that leader of the cowherds men or he was king, Nanda Mahārāja.