"Krsna" Is the Principal Name of God "Krsna" is the principal name of the Supreme Lord: In his prayer, the author of Srimad−Bhagavatam first proposes that Lord Sri Krsna is the primeval Lord and that if any transcendental nomenclature for the Absolute Personality of Godhead is to be accepted, it should be the name Krsna, the all−attractive.… In Padma Purana it is also stated that of the innumerable names of the Lord, the name of Krsna is the principal one.
¯Teachings of Lord Caitanya

The name "Krsna," indicating the Supreme Lord, is the name of the highest order: In the Vedic literature the supreme person is properly claimed to be Krsna. The name
"Krsna," indicating the Supreme Lord, is the only truly intelligible name of the highest order. He is the controller of both material and antimaterial energies, and the very word "Krsna" signifies that He is the supreme controller.
¯Easy Journey to Other Planets

According to Vedic knowledge "Krsna" is the supreme name of God: When we speak of Krsna we refer to God. There are many names for God throughout the world and throughout the universe, but Krsna is the supreme name according to Vedic knowledge. Therefore Lord Caitanya Mahaprabhu recommended the chanting of Hare
Krsna, Hare Krsna, Krsna Krsna, Hare Hare/ Hare Rama, Hare Rama, Rama Rama, Hare Hare as the supreme means for realization in this age.
¯Raja−vidya: The King of Knowledge

Hare Krishna Hare Krishna Krishna Krishna Hare Hare

Hare Rama Hare Rama Rama Rama Hare Hare