Mary's father has four daughters, Nana, Nene, Nini and Nono. What is the fourth daughter's name ​

The fourth daughters name is Nono

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Nana, Nene, Nini, Nono, and Nunu.

Explanation:

The second and fourth letters of each name are vowels, so the first name will have a, the second name will have e, the third name will have i, the fourth name will have o, and the fifth name will have u.