Welsh form of John meaning 'God is gracious,' or a variant of Zion, the biblical holy hill.
Sion is the Welsh form of John, and within that simple statement lies an extraordinary genealogy. John derives from the Hebrew *Yochanan* — "God is gracious" — a name so central to the New Testament, carried by both the Baptist and the Evangelist, that it became arguably the single most influential personal name in the history of Western civilization. Its descendants are everywhere: Jean in French, Giovanni in Italian, Juan in Spanish, Ivan in Russian, Sean and Eoin in Irish, and in Welsh, Sion — sometimes written Siôn with a circumflex to mark the long vowel that gives it its distinctive, slightly musical quality.
In Wales, Sion carries the full cultural weight of a name deeply embedded in national identity. Siôn Cent was a fifteenth-century Welsh poet whose moralistic verse grappled with the vanity of earthly things in a tradition directly continuous with medieval religious lyric. In Welsh folklore, Siôn Corn — literally "horn John," referring to the drinking horn — is the Welsh name for Father Christmas, giving the name a festive warmth alongside its spiritual gravity.
The name appears throughout Welsh literature and history as naturally as John does in English texts. For parents outside Wales, Sion offers a compelling proposition: a name with genuinely ancient roots and profound cultural meaning that nonetheless looks clean and modern on the page. Its single syllable gives it punch; its Welsh orthography signals distinctiveness without obscurity. It is pronounced roughly "SHON," which gives it a softness that the spelling doesn't immediately suggest, and that small surprise has become part of its charm for parents drawn to Celtic heritage.