Don't care for it, sorry. It looks like a name for the young of an animal called a "grey"...or the young of a "grey" alien perhaps?
"We have to live without sympathy, don't we? That's impossible of course. We act it to one another, all this hardness; but we aren't like that really, I mean...one can't be out in the cold all the time; one has to come in from the cold...d'you see what I mean?”
John LeCarré