kajari | कजरी
kajari (Devanagari: कजरी ISO15919: kajarī) Kajari was the name of a jet-black cow belonging to Nand Baba's dairy in Nand Goan (Nand Baba's Village). She was Shri Krishna's favorite cow, and He loved drinking her milk the most.
The name Kajari itself means "like kajal" (black kohl), describing her jet-black color.
Further Reading and Reference
Prema Rasa Madira - The Intoxicating Bliss of Divine Love, Vol. 1 Ch. 7