萌萌乖喵兔兔唔
[méng méng guāi miāo tù tù wú]
This name combines adorable (cute elements): 'meow (a cat sound)', 'rabbit', with the addition of a nonsensical word at the end (mumu), indicating the person wants their nickname to seem cute, innocent, childish-like, maybe hinting at a personality trait or preference for cuteness.