The word(s) "mayest" appears 2 time(s) in 2 verse(s) in Quran in Muhammad Habib Shakir translation.

(1) So he watered (their sheep) for them, then went back to the shade and said: My Lord! surely I stand in need of whatever good Thou mayest send down to me.

(سورة القصص, Al-Qasas, Chapter #28, Verse #24)
(Arabic, Transliteration, Urdu (Ahmed Ali), Urdu (Jalandhry), Farsi, Yusuf Ali, Shakir, Picthal, Mohsin Khan, French, Spanish, Indonesian, Malay, German, Bosnian, Russian, Dutch, Italian, Portuguese, Tafsir - Jalal ad-Din, Tafsir - King Fahad Quran Complex)

(2) And whenever I have called them that Thou mayest forgive them, they put their fingers in their ears, cover themselves with their garments, and persist and are puffed up with pride:

(سورة نوح, Nooh, Chapter #71, Verse #7)
(Arabic, Transliteration, Urdu (Ahmed Ali), Urdu (Jalandhry), Farsi, Yusuf Ali, Shakir, Picthal, Mohsin Khan, French, Spanish, Indonesian, Malay, German, Bosnian, Russian, Dutch, Italian, Portuguese, Tafsir - Jalal ad-Din, Tafsir - King Fahad Quran Complex)