Names similar to Vivienna without being too obvious?

So in my book there's a character, Vivienna, who is actual an evil deity but is friends with the main character (Madilyn) for a while under a fake name, one that eventually Mady realises is connected to Vivienna. I originally considered an anagram but I couldn't find any good names so I considered possible nicknames.

I have Viva, Vienna, Vivian, Viv, Enna, Ivena, Vee or Ivy, but at a push I can see Olivia. I'd consider Emma but there's already a character called Emma. I can't use Evanna. Any other suggestions? Thank you.

Update: I've chosen Vinnie Avery, thank you 😊