Dolores Jane Umbridge. The actress who played her in the movies is called Imelda Staunton.
Hermione Jane Puckle instead of Hermione Jean Granger. J.K. Rowling changed the surname very early on as she felt 'Puckle' didn't suit Hermione. Hermione's middle name was not changed until after the fifth book was published and Rowling realised she has given the middle name 'Jane' to Dolores Umbridge. Not wanting Hermione to have a connection to Umbridge, Rowling changed her middle name to Jean.
Not known, if any.
Only if she is the Dolores O' Riordan.
Lolita Milyavskaya's birth name is Lolita Markovna Milyavskaya.
Yes. Her full name is Dolores Clara Fernandez Huerta.
Clara Fernandez
Dolores Hope's birth name is Dolores DeFina.
Dolores Hart's birth name is Hicks, Dolores.
Dolores Mann's birth name is Dolores Gertrude Mann.
Dolores Rosedale's birth name is Dolores Evelyn Rosedale.
Dolores Fuller's birth name is Dolores Agnes Eble.
Dolores Dorn's birth name is Dolores M. Heft.
Dolores Cassinelli's birth name is Cassinelli, Elvere Dolores.
Dolores Claman's birth name is Dolores Olga Claman.
Dolores Camarillo's birth name is Dolores Seplveda Camarillo.
Dolores Sutton's birth name is Dolores Lila Silverstein.