Tsar Nicholas II of Russia was descended from many royal and noble families.
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Patrilineal descent
Nicholas's patriline is the line from which he is descended father to son.
Patrilineal descent is the principle behind membership in royal houses, as it can be traced back through the generations — which means that if Nicholas II were to have chosen an historically accurate house name it would have been Oldenburg, as all his male-line ancestors were of that house. See also Tsars of Russia family tree.
House of Oldenburg:
Descent from Rurik
Nicholas's family, the Romanovs, were originally in-laws of the Rurikids, with no Rurikid blood in them until the Grand Duchess Anna Petrovna of Russia married Charles Frederick, Duke of Holstein-Gottorp, who descends from the Grand Dukes of Kiev and the legendary Viking ruler of Russia, Rurik. See also Rurikid Dynasty.