What is the chemacal name of vodka?

Vodka the entity is vodka. If you mean name brands, there are hundreds. The biggest being:

Stolichnaya, Smirnoff, Skyy, Absolut, Ketel One, Grey Goose, Belvedere, Finlandia, Gordon's, Wolfschmidt, and Seagram's. There are, however, many, many more.