Cyril Syzransky,
NS Goncharova can not come from the ladies who had children only within marriage, first from Pushkin. then from Lansky. Thus comes from the media the names of men - Sergei Mikhailovich, which in turn from Micah. Sergeyevich, much it from Sergei Nikolayevich - Brother Natalia Nikolaevna Goncharova.
http://www.vgd.ru/STORY/rvnsk16.doc - an excellent genealogy Goncharov.