Qais is an Arabic name, usually explained as "firm" or "measure", that was common among the pre-Islamic Arab tribes. Its most famous bearer is Qays ibn al-Mulawwah, the poet-lover known as Majnun in the classic romance Layla and Majnun. In the United States it had fewer than five births in 2000, rose from number 4515 in 2015 to number 3261 in 2024 and reaches its best rank in 2025 at number 2922 with 43 births.