CHANGA, BHAI, a Bahil Khatri, was a devoted Sikh of the time of Guru Arjan. Once he, along with Bhai Phirna and Bhai Jetha of the same clan, waited on Guru Arjan. They had a question: “Some repeat the name of Rama, others of Krsna, some repeat Om, others Soham. We have been taught to meditate on Vahiguru. Tell us.

True King, which name is the most efficacious ?” The Guru, says Bhai Mani Singh, Sikhan di Bhagat Mala, replied, “Any boat would take one across a river, but one should stick to the boat one has boarded. All names of God lead to liberation. For Sikhs the name revealed by Guru Nanak is Vahiguru.” Bhai Changa and his companions concentrated on the name Vahiguru and told others to do so.

References :

1. Mani Singh, Bhai, Sikhan di Bhagat Main. Amritsar, 1955
2. Santokh Singh, Bhai, Sri Gur Pratap Suraj Granth. Amritsar, 1926-37