EXCLUSIVE

TMZ has obtained North West's birth certificate ... and she doesn't have a middle name!

What do Kim Kardashian's new baby and the Space Needle have in common?

They're both NORTH WEST ... TMZ has learned.

Seriously, that's the kid's name ... according to the birth certificate from Cedars-Sinai hospital.

There were rumors floating around a few months ago that Kim and Kanye West might give the baby a directional name ... but who thought they would actually go through with it?

And when you look at the options -- West West is redundant ... South West is an airline ... and East West leads to nowhere.

So, by default ... North West it is!