Princess Adelheid-Marie of Anhalt-Dessau (1833–1916) was the second wife of Adolphe of Nassau., She was Duchess of Nassau from 1851 until 1866 and Grand Duchess of Luxembourg from 1890 until 1905. Her descendants still sit on the throne of Luxembourg today.
Yo, it's ME! I would say some stuff in German but it says only English so I guess not :/ Also, I saw a comment saying how this was Heidi's real name in the book Heidi by Johanna Spyri. Correction; Adelheid was Heidi's mother's name, Heidi was her full first name. Also, I find it so strange that the name Adelheid is praised here and then when you look at the name Heidi you find TOOOOOOONS of people crap-talking Heidi. I go by Heidi because forcing poor substitute teachers to choke out my name during attendance isn't my favourite way to pass the time. Even though having to show people how to spell and pronounce your name all the time, I think naming your kid Adelheid isn't too bad, although I'm probably just being biased :P.
I believe there is one more alternative spelling - AHLHEID. I found it in an 1842 birth record in Osten, Lower Saxony (at the time, Kingdom of Hannover).