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. Yekaterina Vorontsova-Dashkova: Princess Yekaterina Romanovna Vorontsova-Dashkova (Russian: Екатери́на Рома́новна Воронцо́ва-Да́шкова ; 28 March [17 March o.s.] 1743 – 15 January [4 January o.s.] 1810) was the closest female friend of Empress Catherine the Great and a major figure of the Russian Enlightenment. Yekaterina Vorontsova-Dashkova:  Her name was often spelt in English as Princess Dashkov.
Princess Dashkov