here here :

Mendeleev was Russian.
YYY: Oh, and his name comes from the purely Hussic name Mendel...
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The grandfather of Dmitry Ivanovich Mendeleev by father Pavel Maximovich Sokolov in the 1760-1780s was a priest of the Temple of the Blessed Mother of God at a gathering of Pokrovsky-Tychomandritsky of the Vysnevolotsky county of the Tver province. The Sokolov family had 4 sons: Vasily, Timothy, Alexander and Ivan, and 3 daughters: Natalia, Tatiana, and Praskovia. When studying in the Tver Seminary, the sons received different surnames (at that time only nobles had inherited surnames): Vasily Pokrovsky (by the name of the parish), Alexander Tikhomandritsky (the name of the parish), Timothy Sokolov (father's surname), Ivan received the surname Mendeleev. It is most likely to suggest that Ivan Pavlovich received the surname of the nobles of Mendeleev, whose lands were located near the village of Tychomandrica. The tombs of members of this kind have been preserved to this day on the old estate in the village of Ostrovno (6 km from Tychomandrica). Someone, as an option, could be the baptismal father of Ivan Pavlovich. Modern historians have established that at that time several families of Mendeleevs lived in the vicinity of the Upper Volok. Most likely, they were the outcast Germans, whose surname was derived from the word “mandel” – “mandel” or baptized ethnic Jews. The General Herb of the Noble Families of the Russian Empire" writes that Mendeleev is a non-titled Russian noble family.