alastor

noun

1. An avenging spirit or deity, variously associated with the Erinyes, Nemesis, and more.

   “Dog, leave thy snarling, or I'll cut thy tongue out ! Thou unlick'd bear, dar'st thou yet stand my fury, My generous rage? yet? By the sulphureous damps That feed the hungry and incessant darkness, Which curls around the grim Alastor's back, Mutter again, and with one powerful word, I'll call an host up from the Stygian lakes, Shall waft thee to the Acherontick fens; Where, choak'd with mists as black as thy impostures,”

2. In more recent ages, a term of rebuke for a pestilent rascal.

   “1852 James Orton: "Excelsior" or "The Realms of Poesie by Alastor". Private publication printed by William Pickering, London James Orton's choice of "Alastor" seems to have been an ironic pen name, suggesting a presumptuous voice.”

3. A genus of hunting wasp

name

1. (Greek)Any of several characters in Greek mythology, variously spirit, human, a horse of the underworld.
2. A male given name from Scottish Gaelic.