A spelling variant of Jason, from Greek meaning 'healer.'
Jasen is a phonetically modernized rendering of Jason, one of the great heroic names of Greek antiquity. The classical form *Iason* likely derives from the Greek *iasthai*, meaning 'to heal,' linking the name to the same root as *iasis* and the healing arts.
Jason was the leader of the Argonauts, the legendary band of heroes who sailed aboard the Argo to retrieve the Golden Fleece from the kingdom of Colchis — a tale that Homer's contemporaries knew well and that Apollonius of Rhodes immortalized in the *Argonautica* around 250 BCE. The name spread through the Hellenistic world and gained new life in the Christian tradition, as Saint Jason of Tarsus — a companion of Saint Paul mentioned in Romans 16 — carried it into the ecclesiastical naming rolls of Byzantium and the early church. In Eastern European countries, particularly in Slovenia, Croatia, and parts of the former Yugoslavia, the spelling Jasen developed organically from local phonological patterns where the initial 'J' carries a 'Y' sound, giving the name a Slavic warmth.
In contemporary usage, Jasen appeals to parents who love the heroic resonance of the classical original but prefer a spelling that feels more personal, less expected. The 's' in place of the 'c' is a small typographic rebellion that has become its own tradition, appearing steadily in birth records across the United States and Europe since the mid-twentieth century.