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He named Krishna after receiving the name by meditation. From the Vishnu Purana and other Puranas, one understands that although basically of Kshatriya origin, a branch of Gargas became Brahmins and migrated westwards and joined the Yavanas (Ionians). This could be the reason that later day Indians referred to Greek mathematicians and astronomers as Gargacharyas while maintaining that a Vridha-Garga (Earlier or Older Garga) was the pioneer in astronomy.
Gargas were warriors and some text indicates they were the descendants of Guru Dronacharya, the legendary character from Mahabharata. The names Gargas and Garg are not the same. Garg are purely vaishya and have no connection to Rishi Gargas.
Guru Dronacharya was the son of Rishi Bhardwaj's descendant. The descendants of Bharadwaj Gotra display warrior skills, because sage Bharadwaj married a Kshatriya woman called Suseela. According to Anuloma marriage, those born to a Brahmin father and a Kshatriya woman take the characteristics of Kshatriya though technically being a Brahmin. Hence the Brahmin descandants of Bharadwaj Gotra are referred to as Brahma-Kshatriyas(Warrior Brahmins).
Gargi is celebrated female sage Vachaknavi, born in the family of Garga.
Garga the sage is the writer of Garga Samhita.