This is the name of the mother of cutie Daniel Radcliffe, a.k.a. Harry Potter: Marcia Gresham Radcliffe.

It is the name of "Desperate Housewives" actress, Marcia Cross. She is so hot, I have a thing for red-heads.

Marcia the Martian is the name of Marvin the Martian's sidekick in the Looney Toon's spoof show, "Tiny Toons".

This name reminds me of Marcia Brady from "The Brady Bunch".

"Marcia, Marcia, Marcia!"

This name is borne by American actress Marcia Gay Harden (born August 14, 1959). She is best known for her film roles in "The Imagemaker" (1986), "Miller's Crossing" (1990), "Flubber" (1997), "Pollock" (2000), for which she received the Academy Award for Best Supporting Actress, and "Mystic River" (2003), for which she was nominated in the same category. She also has appeared on Broadway in "Angels in America".

Oh, Marcia, I want your long blonde beauty
to be taught in high school

http://plagiarist.com/poetry/93/
(This is a poem by Richard Brautigan; anyone curious about Marcia should read it!)

In the Septimus Heap novels, this is the name of the current ExtraOrdinary Wizard. Her last name is Overstrand.

Actress Marcia Gay Harden, as mentioned above. Very talented.

Lawyer, Marcia Clark.

"Marcia Schuyler," a delightful novel for young girls published in 1908 by Grace Livingston Hill.

"Marcia and I went over the curve," is the first line of the lovely poem "Millions of Strawberries," by the poet Genevieve Taggard. She eventually named her own daughter Marcia.