Namesakes
Bishops of Rome and the Popes:
12 popes
Pius I 140-154 
Pius II 1458-1464
Pius III 1503
Pius IV 1559-1565
Pius V 1566-1572
Pius VI 1775-1799
Pius VII 1800-1823
Pius VIII 1829-1830
Pius IX 1846-1878
Pius X 1903-1914
Pius XI 1922-1939
Pius XII 1939-1958
Harry Potter Characters:
1 character
Pius Thicknesse
Olympic Medalists:
1 bronze
(bronze) Pius Schwizer 2008 equestrian
Other Royalty:
1 prince
Hans-Adam II, Prince of Liechtenstein (a.k.a. Pius) 1989- Liechtenstein
Saints:
3 saints, 1 blessed, 1 venerable
Saint Pius I ?-154
Saint Pius V 1504-1572
Blessed Pius IX 1792-1878
Saint Pius X 1835-1914
Venerable Pius XII 1876-1958