Cyriacus is a Latinized form of the Greek name Κυριακός (Kyriakos), which means "of the lord," derived from Greek κύριος (kyrios) meaning "lord." This name was common among early Christians, reflecting their devotion to Christ as Lord. It appears in the saint tradition, notably borne by a Christian martyr from the Diocletianic Persecution (c. 303 AD).Etymology and Cultural ContextThe Greek kyrios was used in the Septuagint and New Testament to denote God or Jesus, making names like Kyriakos popular among early believers as a declaration of faith. The Latinized form Cyriacus spread through Medieval Latin usage, alongside variants such as Cyril and Cyrillus in other languages.Notable BearersAccording to Christian tradition, Saint Cyriacus (feast day 8 August) was a Roman nobleman who converted to Christianity, renounced his wealth, and was martyred around 303 AD under Emperor Diocletian. He is venerated together with Saints Largus and Smaragdus, though little historical certainty exists beyond their names and burial at the seventh milestone of the Via Ostiensis. The Roman Martyrology lists only seven of the twenty-seven saints named Cyriacus by name.Variants and Related FormsThe feminine form is Cyriaca. In Greek, the direct equivalent is Kyriakos; unrelated but phonetically similar is Kyrillos (from kyrios with a different suffix). Belarusian has Kiryl, Macedonian Kiril, and Slovak uses Cyril, all ultimately deriving from the same root.Meaning: "Of the lord"Origin: Greek, via LatinType: First nameUsage regions: Medieval Latin, Christian world