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Jyutping naa5 seoi4
Pinyin nà shéi

Definitions (Wiktionary)
  1. noun
    a person whose name one has forgotten, or does not want to mention; you-know-who
Examples (Tatoeba—Mandarin-English)
  1. Mandarin
    那谁来照顾你的猫呢 ?
    那誰來照顧你的貓呢 ?
    nà shuí lái zhào gu nǐ de māo ne ?
    • Who'll take care of your cat then?