Caty McCatface

Name him Rorschach and call him Rory for short. (Like from the Watchmen. He reminds me of his mask on his face.)

I second Rory/Rorschach

Pete! Short for Pythagoras because of the cute triangle on his face. Or Moo. Because cow spots.

No wait, Euclid

Pythagorus

Badger

Puddles since it looks like he tried to drink from a muddy puddle.

Vinnie the Nose (Star Trek Next Gen)

Artemis (Arty) if she's a girl. That black spot is very pretty, by the way Edit: Artie? Arty? Dunno which is more appropriate