What is the fictional character Harley Quinn's full real name?

From the world of D.C. Comics.

Dr. Harleen Frances Quinzel is depicted as having been a psychiatrist at Gotham City's Arkham Asylum. Harley's family is portrayed as being very dysfunctional. It has been said that is the reason Harley pursued psychology is that she needed to understand her own dysfunctional family.

The character's origin story says that Harleen Quinzel was once a psychologist at Arkham Asylum and was assigned to treat the Joker. It has been said that she eventually fell in love with the Joker and became his lover and accomplice.

There is some debate that she drove her highschool sweetheart to commit suicide in the name of love and that she made The Joker fall in love with her as her mad experiment about love.

She follows suit in the Joker's clown-themed, criminal antics and adopts the name Harley Quinn, a play on "Harlequin" from the character in commedia dell'arte. Speaking with a pronounced Northeastern accent, Harley refers to the Joker as Mistah J', and Puddin', terms of endearment that have since been used in nearly every adaptation in which the two characters appear.