Justin comes from the Latin Justinus, a derivative of Justus, and means "just" or "righteous". Justin Martyr, a second-century Christian philosopher, and two Byzantine emperors carried the name in antiquity; in recent decades Justin Timberlake and Justin Bieber kept it in the spotlight. In the United States Justin was number 19 in 2000, had fallen to number 110 by 2015 and ranks number 233 among boys' names in 2025.