Today's name: Heidi
Potential nicknames: Dee/Di, DiDi, Heid...
Origin: Surprisingly, Heidi is the short form of the Old German name Adelaide, meaning "exhalted nature," although Adelaide means "noble kind." Kind of the same thing. Simply put, they both mean "noble person." Heidi can also be a nickname for Hildegard and Heidrun.
Popularity: In 2010 there were 1,059 baby girls named Heidi, ranking at #303 on the U.S. top 1000. There were also 9 baby girls spelled Heide and 334 spelled Heidy. In 2011 it ranked at #331, a slight fall, with 943 births.
Fun fact: (1) You might recognize this name from Johanna Sprydi's novel "Heidi," in which there is a main character from the Swiss Alps with the same name, although her full name was Adalheid (Adalaide). This has been made into a 1937 movie. (2) Heidi Montag, a famous actress. (3) Adelaide was popular due to Queen Adelaide, the German princess who married Prince William IV. Adelaide has 57 variant forms, but I'll save that for a different post. (4) Supermodel Heidi Klum. (5) Heidi Fleiss, and several other famous Heidi's.