Zaid (زيد) also transliterated as Zayd is an Arabic name, meaning "abundance", "growth" or one who progresses and makes other people progress.
One of the most famous persons in Islam under the name of Zayd is Zayd ibn Harithah, who was the orphan boy fostered by the Muslim prophet Muhammad, who treated him as his own son to the extent that he was called "Zayd ibn Muhammad", ("Zayd the son of Muhammad") instead of Zayd ibn Harithah ("Zayd the son of Harithah"). Zaid ibn Harithah is also the only Sahaba mentioned by name in the Qur'an. Another well-known Islamic figure with the name of Zayd is Zaid ibn Thabit. Zayd is a popular given name among the Zaydi branch of Shia Islam.