How hard must creating a new name should be?

A bit if relevant context first:

One of magic powers in my world is Mimicry. This is Fey-like powers that are given directly by the Raven, a God of Chaos, Turmoil, Distraction and Death, and a trickster. One of the abilities of the power is trading/stealing attributes of a person, including names. Losing the name is dangerous and almost always fatal. Name is tied to your life and past. Without it no one will recognize or remember you at all at you would quickly transform into some other nonhuman form or turn into a monster ( one character at the start of a story turned into a bird after giving away her name.) And taking other persons name will make everyone perceive you as that person. It does not change you physically or make you seem different, everyone just perceive you as that person. And it give you all of the memories of that person too( person who lost name do not lose his memories but no longer perceive them as his on an emotional level).

Now the question:

I want to find a way to create a new name instead of stealing it from someone. And I want it to be hard. Like a ritual. My idea is this: you need to find new people you have never met, form a strong and meaningful memory in your head (like friendship or even love). Then collect this memory. You need to do this 27 times (I like the 3x9 idea) to get 27 unique memories from 27 different people. You then use them in a ritual to create a new name for disguise or for any other reason. Is this reasonable? Or should i change something?