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Siôn is the Welsh form of John, ultimately derived from the Hebrew name Yohanan, meaning God is gracious. It entered Welsh through Latin Iohannes and has been in continuous use in Wales for centuries, closely tied to Welsh-language culture and the Christian tradition. The circumflex accent marks the long vowel, distinguishing it from other forms. Related names include Ieuan, Ifan, and Evan, all Welsh equivalents of the same Hebrew original.