Bandhu-han means
Sri Caitanya-caritamrta
CC Antya-lila
The word bandhu-han means "the killer of māyā."
CC Antya 5.143, Translation and Purport: “The demon Jarāsandha chastised Kṛṣṇa, saying, "You are the lowest of human beings. I shall not fight with You, for You killed Your own relatives."
In this verse also, mother Sarasvatī offers prayers to Kṛṣṇa. The word puruṣa-adhama refers to the Personality of Godhead, under whom all other persons remain, or, in other words, puruṣa-uttama, the best of all living beings. Similarly, the word bandhu-han means "the killer of māyā." In the conditioned state of life, one is closely related with māyā as a friend, but when one comes in contact with Kṛṣṇa one is freed from that relationship.