CC Ādi 10.66
akiñcana prabhura priya kṛṣṇadāsa-nāma
Śrī Caitanya Mahāprabhu gave Vijaya dāsa the name Ratnabāhu [“jewel-handed”] because he copied many manuscripts for Him. The twenty-eighth branch was Kṛṣṇadāsa, who was very dear to the Lord. He was known as Akiñcana Kṛṣṇadāsa.
Akiñcana means “one who possesses nothing in this world.”