The name marijuana comes from a Mexican slang term for cannabis and is believed to have derived from the Spanish pronunciation of the names Mary and Jane. (The two names were also common Mexican military slang for a prostitute or brothel.) Marijuana came into popularity as a name for cannabis in the U.S. during the late 1800s.
There are over 200 slang terms for marijuana in the popular vernacular. Some of the more common nicknames include pot, grass, weed, hash, and ganja.