надо

• IPA^(key): [ˈnadə]

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From Old East Slavic надъ (nadŭ), надо (nado), from Proto-Slavic *nadъ

на́до • (nádo) (+ instrumental case)

1. (variant of над (nad) before words beginning with certain awkward consonant clusters such as мн-) above, over

   на́до мной ― nádo mnoj ― above me

From Old East Slavic надо (nado), надобѣ (nadobě), from dative/locative singular of надоба (nadoba), from Proto-Slavic *nadoba, from *na- +‎ *doba.

на́до • (nádo)

1. (one) must, (it is) necessary
2. one needs, one wants, one has to

   Мне на́до уйти́. ― Mne nádo ujtí. ― I have to leave.

   Так ему́ и на́до! ― Tak jemú i nádo! ― Serves him right!

   на́до бы ― nádo by ― (one) ought to

The word combination, не на́до, is used in combination with imperfective infinitive verbs. For example,

Не на́до печа́литься. ― Ne nádo pečálitʹsja. ― There is no need to be sad.

Не на́до держа́ть отве́т. ― Ne nádo deržátʹ otvét. ― There is no need to answer.

Не на́до бы́ло пуга́ть бе́лок. ― Ne nádo býlo pugátʹ bélok. ― There was no need to scare the squirrels.

• Vasmer, Max (1964–1973), “над”, in Etimologičeskij slovarʹ russkovo jazyka [Etymological Dictionary of the Russian Language] (in Russian), translated from German and supplemented by Trubačóv O. N., Moscow: Progress
• Vasmer, Max (1964–1973), “надо”, in Etimologičeskij slovarʹ russkovo jazyka [Etymological Dictionary of the Russian Language] (in Russian), translated from German and supplemented by Trubačóv O. N., Moscow: Progress
• Trubačev O. N., editor (1995), “*nadъ”, in Etimologičeskij slovarʹ slavjanskix jazykov [Etymological dictionary of Slavic languages] (in Russian), volume 22, Moscow: Nauka, page 15

From Proto-Uralic *nataw.

надо (nado)

1. brother-in-law
2. cousin