Leszek II the Black
The name Lech or Leszek, Lestko, Leszko, Lestek, and Lechosław is a very popular name in Poland. Lech was a popular male name among members of Piast dynasty like Lestko, Leszek I the White, Leszek II the Black, Leszek, Duke of Masovia, Leszek of Racibórz.