Namesakes
Fictional Characters from Song Titles:
1 character
(character) Adelaide 2007 Adelaide 
Fictional Characters from Television:
2 characters
Addie Horton 1965 Days of Our Lives
Adelaide Langdon 2011 American Horror Story: Murder House
Notable Musicians:
1 musician, 1 singer
Adelaide Hall 1901-1993
Héloïse Adélaïde Letissier 1988-
Olympic Medalists:
1 gold
(gold) Adelaide Lambert 1928 swimming - 4x100 m freestyle relay
Other Royalty:
1 grand duke, 1 princess, 1 princess/empress consort/queen consort
Victoria, Princess Royal (a.k.a. Adelaide) 1840-1901; 1888 United Kingdom; German Empire; Prussia
Viktoria Luise of Prussia (a.k.a. Adelaide) 1892-1980 Prussia
Marie-Adélaïde, Grand Duchess of Luxembourg 1912-1919 Luxembourg
Saints:
3 saints
Saint Adelaide of Italy 931-999
Saint Adelaide 960-1015
Saint Aleydis of Schaerbeek (a.k.a. Adelaide) 1220-1250