So I found out how the sperm whale got it's name....

apparently back in the day, when scandanavian whalers would harpoon these gigantic beasts of the sea, the harpoon would occasionally hit the head of the whale, releasing a white-gooey substance.

naturally, these fools began to believe that this is where the whale keeps his sperm (in his head!) and hence gave it that name. yet in fact, the gooey substance is something other than semen... it actually helps the whale with it's sonar.

yeah... these dudes use sonar! so it helps emit a low frequency from the head of the whale that stuns it's prey so the whale can attack it. and it is most frequently used in the first ten years of the whales life, because during that time the poor bastard still has to grow his teeth

so there ya have it...
kudos to Dawn from florida for that.