Here are a few famous samurai, click on the names to read more about them. The links go to the Samurai Archives an awesome web site on samurai history. There are more famous samurai on that site than I have listed here.
Ashikaga period Shugo and the assassin of Shogun Ashikaga Yoshinori (D. 1441)
Mino no Kami; one of 'Shingen's Twenty-four Generals' (1514 - 1575)
Tokugawa retainer and reputed 'ninja' leader (1541 - 1596)
Legendary warrior and hero of the 'later three-year war' (1041-1108)
Daimyo of Owari and the first of the "Three Unifiers" (1534 - 1582)