why is it called legally blonde?

good question

Because shes in law school and shes blonde. Its pretty simple when you think about it

Because shes in law school and shes blonde

its a reference... on the outside she looks like a miss america, blonde hair, big boobs... shes the Marilyn, not the Jackie... and throughout the movie she is trying to prove to others as well as to herself, there is more to her than just her looks... and that Blonde Bimbo girls are more than just make-up and fashion, but they have good heart, are good friends and are smart too... she proves she is legally blonde - that she should be taken seriously and be treated equally like others, even though she likes to be goofy, light-hearted and open-minded (or more like eccentric) than others... she is proving that not all blonde miss america are dumb, therefore Legally blonde... at least thats how i understood it... what u think???

is it a pun? is it supposed to sound like something else?

The original title was actually Legally Bombed, with the film intended to be far more dark in tone.
The story concerned Miss Elle Woods - a perky and popular college student, who turns to the bottle after her boyfriend ditches her for a smarter girl and law school.
Elle also enrolls at Harvard to show her ex that she's just as intelligent; unfortunately, Elle spends more time at keggers than in the classroom. She also wanders around the campus in a drunken haze, randomly yapping at people, "DO YOU KNOW WHO I AM?! WELL, DO YOU?!"
Too bad the plot was altered, as we know now that Reese would have nailed it.

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Its a play on 'Legally Blind' :)