Namesakes
Olympic Medalists:
1 bronze, 1 bronze/silver
(bronze/silver) Jadwiga Wajs-Marcinkiewicz 1932; 1936 discus throw 
(bronze) Maria Kwaśniewska-Maleszewska (a.k.a. Jadwiga) 1936 javelin throw
Polish High Dukes and Kings:
1 queen
Queen Jadwiga 1384-1399
Saints:
2 saints
Saint Hedwig (a.k.a. Jadwiga) 1174-1243
Saint Jadwiga of Poland 1374-1399