Namesakes
Bishops of Rome and the Popes:
1 antipope
Albert (a.k.a. Adalbert) 1102 
Other Royalty:
2 princes
Adalbert of Prussia 1884-1948 Prussia
Louis Ferdinand of Prussia (a.k.a. Adalbert) 1907-1994 Prussia
Saints:
2 blessed, 2 saints
Saint Adalbert of Egmond ?-740
Saint Adalbert of Prague 956-997
Blessed Jan Adalbert Balicki 1869-1948
Blessed Wojciech Nierychlewski (a.k.a. Adalbert) 1903-1942
Tolkien's Characters:
1 character
Adalbert Bolger (m)