"Don't know." It's said with a shrug. Maybe if she'd had more human contact it would start bothering her, but for the time being she doesn't particularly care. After all, what's a last name other than a way to designate who your family is? And it's not like she has a family, to the best of her knowledge.

A real, little smile creeps onto her face before she answers his second question, despite how hard she's trying to remain impassive. "Aperture Science Weighted Companion Cube. A friend."

Chell doesn't exactly like being asked so many questions. Not that she'd rather be put through her paces on a testing track, but there's something about it that just irritates her. So she decides to try to turn the tables and get a couple answers of her own. "Is this another test? Did she send you after me?"