"What should we gain, O Krishna, husband of the goddess of fortune, and how could we be happy by killing our own kinsmen?" (Bhagavad-Gita 1.36)
Also in the Bhagavad-Gita, Arjuna address Krishna as "Madhava" (meaning "Lord of fortune and also slayer of the demon Madhu").
According to Adi Sankara' s commentary on the Vishnu sahasranama, Madhava means the consort (dhava) of the Mother (Ma), or Mahalaksmi, the Mother of the universe. Alternatively, it means on who is fit to be known through Madhu-vidya or can mean One who is the Lord of "Ma" or knowledge.
Additionally, it can also mean 'one who was born in the clan of Madhu'.
- Maharishi Mahesh Yogi on the Bhagavad-Gita, a New Translation and Commentary, Chapter 1-6. Penguin Books, 1969, p 37 (v 14)