I'm sure this has been posted about before, but I'm not quite sure what to search in order to find the answer.

The script I'm currently writing begins over black, with the protagonist speaking in VO.  Should I give him a name in the character line?  Or refer to it as "Voice" or "Our Unseen Protagonist"?

I did something like this with Grid-Lock and I was never sure what was correct.

Is there any reason to hide the Protagonists name so early in the script, Gage?

If not, I'd just give his name.

Nope, no reason.  Just figured this was a technicality.

Name him.

Unless you want to keep the character's identity a secret, name him.  Otherwise, it'll be confusing for the reader when you change his name.  The only time when you keep a character's identity a secret is when you're writing a mystery, or something like that.


Phil

Here's how Alan Ball wrote the intro to "American Beauty," He identifies Lester right off.   No reason to hide the protagonist unless there is going to be a twist down the road.

EXT. ROBIN HOOD TRAIL - EARLY MORNING

We're FLYING above suburban America, DESCENDING SLOWLY toward a tree-lined street.

LESTER (V.O.)

My name is Lester Burnham. This is my neighborhood. This is my street. This... is my life. I'm forty-two years old. In less than a year, I'll be dead.

Only be mysterious if it's in service to your story.
You must have a legit narrative reason for the fancy-pants intro.

Don't throw devices at your script just to spice up a scene.
Just work the scene, don't worry about the fancy finish.

But if you're going to do it anyways, try this...

EXT. PARK - DAY

A WOMAN jogs. SOMEONE watches her...

CREEPY MALE VOICE (V.O.)
One day, you'll be mine.

Regards,
E.D.

In "Phone Booth", the writer uses "Narrator" and then switches it to "Voice" when Keifer Sutherland is speaking on the phone. There's no hard rule - I think - as long as it's clear and the anonymity has a purpose.