Here are some anti-hero name options for Edith Eastcote, an Icelandic hitwoman skilled with blades, playing with different aspects of her background and skills:

Names emphasizing her Icelandic heritage:

• Frostbite: Evokes the cold Icelandic climate and her deadly nature.
• Valkyrja: A nod to Norse mythology, suggesting a warrior woman.
• Bjornhildr: A strong, traditional Icelandic name with a fierce sound.
• Reykjavik's Shadow: A location-based name hinting at her secretive operations.
• Glacial: Simple, yet evocative of her cold, calculated demeanor.

Names highlighting her skill with blades:

• Nightshade: Suggests stealth and deadly precision.
• Razor's Edge: Directly references her weapon of choice.
• Silken Steel: A paradoxical name, implying both grace and lethality.
• The Serpent's Kiss: A metaphorical name suggesting a swift, fatal strike.
• Whisperwind: Suggests silent movement and deadly efficiency.

Names combining heritage and skill:

• Bjorn's Shadow: Combines a traditional Icelandic name with a sense of mystery.
• Frostbite's Kiss: A chilling combination of cold and deadly precision.
• Valkyrja's Blade: Directly links her Norse heritage to her weapon.
• Glacial Serpent: A powerful image combining cold indifference and deadly cunning.
• Reykjavik's Razor: Combines location with her deadly skill.

More abstract and evocative names:

• Wraith: Suggests a ghostly, elusive presence.
• Raven's Wing: A dark and mysterious image.
• Iron Maiden: A classic anti-hero archetype.
• Winter's Bite: Evokes a cold, unforgiving nature.
• Shadow Walker: Suggests stealth and secrecy.

These are just a few ideas; the best name will depend on the specific tone and style of your project. Consider which name best captures Edith's personality, motivations, and the overall atmosphere of your story.