Which Greek god or goddess was nicknamed "Spear-shaker" and why?

At first her name was Pallas Athene, as she is called by Homer in The Iliad; though sometimes he calls her just Athene or just Pallas, but after about 500 BC she is referred to as Athena, after her whom her namesake city was called and of which she was patron goddess. Pallas is really an epithet for her and means the "spear shaker," and spear shaking was the dominant intimidating attitude of a warrior back then.

http://www.thevalkyrie.com/stories/html/athene/index.htm

Also- Shakes -speare= speare shaker was also derived from Athena.........

I saw that...most interesting!

"That he had been called spear shaker (hasti vibrans) since childhood, and that this association became further strengthened by his tourney exploits and Gabriel Harvey's rhetoric, ("Thine eyes flash fire. Thy countenance shakes spears"), cumulatively created the perfect match with Shakspere."

http://www.wjray.net/shakespeare_papers/shakespeare-name.htm