Bhai Kukko Wadhawan was a dedicated Sikh of the time of Guru Hargobind Sahib. Once he, along with his son Bhai Ananta (who embraced martyrdom in the battle of Amritsar, on April 13, 1634), visited Guru Sahib and asked what was the most important Shabad (word) to be recited. Guru Sahib tod them that Satnam (The True Name) was the most important.
(Dr Harjinder Singh Dilgeer)