Cognomen Wacław (Václav 
, Wacław 
, Waclaw 
) , across the world, is a widespread surname. The family name Wacław is habitual in Eastern Europe, particularly Poland, where it is a common surname, Czechia, where it is quite a rare surname, and Slovakia. Also, Wacław is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Václav | Germany, Poland, Czechia, United States, Slovakia |
| Wacław | Germany, Poland, Czechia, United States, Lithuania |
| Waclaw | Germany, Poland, Brazil, United States, France |
| Вацлав | Kazakhstan, Ukraine, Belarus, Lithuania, Russia |
Vaclau, Vaclaw, Vaslav, Vatslav, Vencel, Venceslao, Venceslas, Venceslav, Ventseslav, Venčeslav, Viachaslau, Viatcheslav, Vjacseszlav, Vjatjeslav, Vjatšeslav, Vjačeslav, Vyachaslau, Vyachaslaw, Vyacheslav, Věnceslav, Wac, Wenceslas, Wenzel, Wenzeslaw, Wjatscheslaw, В'Ячеслав, Вацлаў, Венцел, Венцель, Венцеслав, Венчеслав, Вячаслав, Вячаслаў, Вячеслав, and Слава
| eugeniusz wacław PL (b. 1912) |
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| bartłomiej wacław Polish physicist, PL |
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Lis, Markowski, Stefański, Czarnecki, Barański, Brzeźniak, Kamiński, Dziurzyński, Dąbrowski, Gromnicki, Jezierski, Ostrowski, Sokołowski, Smardzewski, Kozłowski, Kołodziej, Piotrowski, Grzybkowski, Tarasewicz, Żuchowski, Szymanowski, Lewandowski, Zawadzki, Pawłowski, Kowalski, Bujalski, Ryba, Mazur, Mucha, Satława, Borek, Kurek, Król, Rejek, Guzik, Nowak, Leśniewski, Warias, Zięba, Serafin, Szubert, Koniuch, Potocki, Radecki, Golonka, Gąsior, Jarząbek, Świdrak, Zając, and Kołodziejski