Type Word & Element Usage Old Slavic (Hypothetical) Scripts болѥ(Church Slavic) Meaning & History Slavic word meaning "more, better" [1][2]. Related ItemsFamily Tree·Details Given Name DescendantsBoleslav, Boleslava(Czech) Boľeslavŭ(Old Slavic) Bolesław, Bolesława(Polish) Sources & References Derksen, Rick. Etymological Dictionary of the Slavic Inherited Lexicon. Brill, 2008, page 52. Trubachyov, Oleg. Etimologicheskiy Slovar Slavyanskikh Yazykov (vol. 2). Moscow, 1974-, page 193.