bahuni santi namani
rupani ca sutasya te
tany aham veda no janah
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
For this son of yours there are many forms and names according to His transcendental qualities and activities. These are known to me, but people in general do not understand them.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Bahuni: the Lord has many names. Advaitam acyutam anadim ananta-rupam adyam purana-purusam nava-yauvanam ca. As stated in the Brahma-samhita (5.33), the Lord is one, but He has many forms and many names. It was not that because Garga Muni gave the child the name Krsna, that was His only name. He has other names, such as Bhaktavatsala, Giridhari, Govinda and Gopala. If we analyze the nirukti, or semantic derivation, of the word “Krsna,” we find that na signifies that He stops the repetition of birth and death, and krs means sattartha, or “existence.” (Krsna is the whole of existence.) Also, krs means “attraction,” and na means ananda, or “bliss.” Krsna is known as Mukunda because He wants to give everyone spiritual, eternal, blissful life. Unfortunately, because of the living entity’s little independence, the living entity wants to “deprogram” the program of Krsna. This is the material disease. Nonetheless, because Krsna wants to give transcendental bliss to the living entities, He appears in various forms. Therefore He is called Krsna. Because Garga Muni was an astrologer, he knew what others did not know. Yet Krsna has so many names that even Garga Muni did not know them all. It is to be concluded that Krsna, according to His transcendental activities, has many names and many forms.