first of all, its senju, not sinju, otherwise, remember that the namikaze isn't actually a clan, and uchiha and senju are about equal. if namikaze were a clan though, they would be strongest due to the flying thunder god technique.
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No there is a Namikaze aka Uzumaki clan
The Konoha Council and Danzo were the ones who told Itachi to kill the Uchiha clan.
There is no "Last Survivor of the Uchiha Clan", but there are "Last Survivors of the Uchiha Clan" whom are Madara Uchiha and Sasuke Uchiha. Although the "Last Survivor of the Uchiha Clan" is most likely to be Madara after Sasuke dies since Madara will live eternally, according to fan predictions. Madara,Sasuke and Itachi.....now only Sasuke,but the other 2 are also revived by edo tensei
Itachi Uchiha part of the Uchiha clan also a member of the akatsuki
Minato Namikaze (Fourth Hokage) was a great hero of the Third Great Ninja War. He assassinated many Iwagakure shinobi, and therefore had many enemies. That is why Naruto's surnname is his mother's rather than his father's; if Iwa knew that he was the Fourth's son, they would probably try and kiddnap him.