From wikipedia :
Nike (/ˈnaɪki/; Greek: Νίκη, "Victory", pronounced [nǐːkɛː]), in ancient Greek religion, was a goddess who personified victory, also known as the Winged Goddess of Victory. The Roman equivalent was Victoria.
The name brand Nike just do it. What does that exactly mean?
Nike is Greek for victory, and the 'just do it' attitude is something held by most sporty people, and Nike is a sportswear store.
The "Just Do It" Slogan slogan was created in 1988 at an advertising agency meeting.
The agency was called Wieden+Kennedy, and you might be interested to know that they apparently credit the most memorable advertising phrase in history to the last words of Gary Gilmore, a deathrow inmate who was executed in 1977.
His last words were apparently "Let's do it."