Sergei
Sergei Gavrilovich Simonov lived from 1894 to 1986, and designed the Samozaryadnyi Karabin sistemi Simonova (SKS), or "Self-loading Carbine, Simonov's system," in 1945. You can read more about him here.
The winning name for my SKS was submitted by my friend @jea_nine from Twitter. She wins my eternal gratitude, and the adoration of millions.
Thank you, @jea_nine!