How is the name of this princess, who has a brother named Semyon Vorontsov, and who was a  major figure of the Russian Enlightenment, often spelled in English?
Semyon Vorontsov Count Semyon Romanovich Vorontsov (Russian: Семён Романович Воронцо́в ; 26 June 1744 – 9 July 1832) was a Russian diplomat from the aristocratic Russian Vorontsov family, whose siblings included Alexander Vorontsov, Elizaveta Vorontsova and Yekaterina Vorontsova-Dashkova.
Nikolay Muraviev Nikolay Valerianovich Muraviev or Muravyov (Russian: Никола́й Валериа́нович Муравьёв ) (1850–1908) (anglicized Nicholas V. Muravev) was an Imperial Russian politician, nephew of the famed Count Nikolay Muravyov-Amursky, explorer and Governor General of the Russian Far East.