Decius is a Roman family name derived from an Oscan variant of the praenomen Decimus, meaning "tenth" in Latin. The name was used among several early Roman consuls and is most famously associated with the 3rd-century Roman emperor Gaius Messius Quintus Trajanus Decius, commonly known as Trajan Decius (c. 201–251 AD).EtymologyThe name Decius originates from the Oscan language, an Italic tongue spoken in southern Italy before Latin dominance. It is a variant of the Latin praenomen Decimus, which denoted the tenth child or tenth-born in a family. Over time, Decius evolved into a hereditary family name within the Roman gens, indicating aristocratic lineage.Notable BearersSeveral notable figures bear the name Decius in Roman history. The earliest was Publius Decius Mus, a Roman consul who famously devoted himself to the gods in battle during the Latin War (340–339 BC) to secure victory, a story recorded by Livy. Another Publius Decius Mus repeated this self-sacrifice in the Third Samnite War (295 BC). Later, the Emperor Trajan Decius, born in Illyricum (modern-day Serbia), rose to power in 249 AD after defeating Emperor Philip the Arab. His reign is most remembered for the Decian Persecution of Christians, in which he ordered all subjects to offer sacrifices to the Roman gods. This edict led to the martyrdom of Pope Fabian and many others. Decius died alongside his son Herennius Etruscus in the Battle of Abritus (251 AD) against the Goths.Cultural SignificanceThe Decian Persecution was a watershed moment in early Christian history, marking the first empire-wide effort to enforce pagan worship. The name Decius thereby carries conflicting connotations: one of Roman traditionalism and imperial authority, and another of religious persecution from a Christian perspective. In later periods, the name was revived occasionally in European naming traditions, though it remains relatively rare as a given name today.Distribution and Related FormsDecius was most common among the Roman elite. Its Portuguese cognate, Décio, continues the legacy in modern Romance languages. As a praenomen-derived family name, it shares origins with the more common Decimus and other numerical names like Quintus, Sextus, and Septimus.Meaning: Family name derived from „tenth“Origin: Roman, with Oscan influenceType: Patronymic/surname from a praenomenUsage regions: Ancient Rome, rare in modern times; Portuguese form Décio in use.