Anybody knows why Operation Marita was named like this?

Barbarossa e.g. was originally named Fritz, because Generalmajor Bernhard von Loßberg happened to have a son named Fritz. WP doesn't seen to know why Marita, the invasion of Greece, was named like this. I've also checked the various prominent Maritas mentioned in WP, but the only one which might apply would be a Marita Gründgens, sister of the gaysexual theatre actor/director Gustaf who compromised with the Nazis. (There's a good novel/roman a clef about him, named "Mephisto", but I digress.)

I also wouldn't deem it impossible that the Nazis used a fictional character as a namesake, but only candidate I can think of is "Gräfin Mariza", some schmaltzy movie as it seems. Close but no cigar.

Anybody knows more?