"Greg" is usually a nick-name for "Gregory". The names Greg and Gregory come from Latin roots and mean attentive, observant, shrewd, or watchful.
Greg is a short form of Gregory. It comes from the Greek gregoris meaning 'watchful' or 'vigilant.'
Greg is Latin for complete Loser, Although it's Origination may sound disturbing, You Gregory's out there must remember The Truth Hurts.
Greg is short for gregory and it means and ass-hole thats a total teachers boy has no respect for one or another and a pathetic!!