Mieczysław (Polish pronunciation: ) or Mečislovas (Lithuanian) is a Slavic name of Polish origin and consists of two parts: miecz 'sword', and sław 'glory, famous'. Feminine form: Mieczysława. Alternate form: Mieszko. Mieczysław (Polish pronunciation: ) or Mečislovas (Lithuanian) is a Slavic name of Polish origin and consists of two parts: miecz 'sword', and sław 'glory, famous'. Feminine form: Mieczysława. Alternate form: Mieszko.