Namesakes
Fictional Characters from Books:
1 hero
Heidi 1880 Heidi 
Notable Actors and Entertainers:
1 actor
Adelheid Roosen 1958-
Olympic Medalists:
1 bronze
(bronze) Heidi Robbiani 1984 equestrian
Other Royalty:
2 princesses, 1 grand duke, 1 queen consort
Emma of Waldeck and Pyrmont (a.k.a. Adelheid) 1879-1890 Netherlands
Viktoria Luise of Prussia (a.k.a. Adelheid) 1892-1980 Prussia
Marie-Adélaïde, Grand Duchess of Luxembourg (a.k.a. Adelheid) 1912-1919 Luxembourg
Cecilie of Prussia (a.k.a. Adelheid) 1917-1975 Prussia
Saints:
1 saint
Saint Adelaide (a.k.a. Adelheid) 960-1015