Greko, son of Garjak, was a male Ferengi, noted for his atypically boisterous, aggressive, and blunt nature. He left his homeworld of Ferenginar as a young adult to work on a Ridorian merchant ship, and at one point, he saved his captain's life when they ran afoul of a Klingon bird-of-prey. The captain rewarded young Greko, and Greko used this money to buy a warp drive from the Breen, and bring it home to Ferenginar. (ST - New Worlds, New Civilizations short story: "A Dry Day on Ferenginar")