Harpy

Harpy is a nickname for Daphne Worth. We don't appear to know the origin (yet), but it may be because she tends to mother Chaz a bit.

Chronologically, the first known appearance is in a comment from her on an entry in Chaz's LiveJournal:
 * Providence. Coffee milk. Portugese sweet yeast bread. Happy harpy.
 * God, I hope we have time to go for chowder. I want chowder. [].

The first appearance in an episode is in "Overkill", episode 1x07, where he and Daphne are climbing a wall in San Diego:
 * "Good job, Harpy." Chaz grinned, and made sure he'd taken in all the slack she just made.