Some theorize about it being named after Josephus 'Joe' Daniels, secretary of the navy. He banned the popular alcohol consumption and instead encouraged the sailors to drink coffee (which was later known as the marine's best friend). That supposedly led the sailors to - most likely in a playful manner - ask for a cup of ''joe'' (coffee) and the tradition kept going on. Another theory says sailors probably shortened the phrase "a cup of java" (a slang term for coffee, since most coffee beans came from the island of Java at the time) to "a cup of j" or "a cup of joe." The term has been found in literature as early as 1840's, though, so no one can say for sure how the term came to be used.
LOL, a cup of joe, my family say this sometimes really randomly with an american accent....ohh ho ho.
to answer your question...maybe a guy in history was called joe and he loved coffee soo much, people in the village starting referring coffee as joe.
it is a navy term. i'm a military kid, lol i know this answer!
why is the toilet sometimes called the john? ...