 Variants and related names include "Piotrowicz", "Piotrowiak", "Piotrowsky", "Pietrowski", "Pietrkowski", "Pietrowsky", and "Pietrowiak".This surname is mainly found in Poland and Russia and the former territories of the Polish-Lithuanian Commonwealth.It is particularly widespread in Poland, where it is the 19th most common surname, with 61,844 bearers in 2009.