Just because they sound or are spelled the same is in no way an indication of the common origin of the name. How in the world did the name get to be used in Russia if its Arabic. Cultural and social aspects as well as geographical must be considered. It doesnt make sense that its in any way Arabic. Solayka could be from slavic word for power (sila) or salt (sol) while -ika/yka or -iyka/ayka is a common diminutive ending in Slavic names (cf. Serb. Milojika, Milojka, Sojka, Slavujka - 'j' pronounced as the eng. 'y').