Ms. Smiles's Creepypasta Name Variations:

Emphasizing the unsettling juxtaposition of her name:

• The Smiling Apparition
• Smiling Sally (classic, but effective)
• The Cheshire Grin
• The Ever-Smiling One
• The Unblinking Smile
• The Ghastly Grinner
• The Perpetual Smile
• The Grinning Ghoul
• The Deceptive Smile
• The False Smile

Highlighting potential sinister aspects:

• Ms. Smiles's Shadow
• The Shadow of Smiles
• The Twisted Smile
• The Rotting Smile
• The Bloody Smile
• The Fanged Smile
• The Malignant Smile
• The Corrupted Smile
• The Withered Smile
• The Hollow Smile

Focusing on mystery and ambiguity:

• The Enigma of Smiles
• The Whispering Smile
• The Silent Smile
• The Nameless Smile
• The Forgotten Smile
• The Obscure Smile
• The Hidden Smile
• The Elusive Smile
• The Unknown Smile
• The Enigmatic Smile

More creative and evocative options:

• The Smile That Never Fades
• The Smile That Haunts Your Dreams
• The Smile That Steals Your Soul
• The Smile That Cuts Like Glass
• The Smile That Freezes Your Blood
• The Smile That Echoes in the Dark
• The Smile That Lurks in the Shadows
• The Smile That Promises Nothing
• The Smile That Knows Your Secrets
• The Smile That Will Never Leave You

These names aim to capture the unsettling nature of "Ms. Smiles" while offering diverse options for a creepypasta story. The best choice will depend on the specific tone and plot of your narrative.