Modern spelling of Aidan, from Irish Aodhán, meaning "little fire."
Aiyden is a creative orthographic variant of Aiden, itself the anglicization of the Irish Aodhán — a diminutive of Aodh, the ancient Celtic god of fire and the sun. The name means 'little fire,' and it was borne by several early Irish saints, most notably Saint Aidan of Lindisfarne (c. 590–651), the Irish monk who brought Christianity to Northumbria and founded the monastic community of Lindisfarne on a tidal island off the northeast coast of England.
His gentle, scholarly evangelism made him one of the most beloved figures of the early medieval church. For most of the 20th century, Aidan remained a relatively quiet Irish name. Then, in the late 1990s, the character Aidan Shaw appeared in 'Sex and the City,' and the name's irresistible warmth — both literal (fire) and temperamental — caught the Anglophone world's attention.
By the 2000s and 2010s, Aiden and its countless variants (Ayden, Jayden, Kayden, Brayden) became the defining naming phenomenon of a generation, spawning what linguists called the '-aden' rhyme explosion. Aiyden, with its distinctive 'iy' digraph, is a thoroughly 21st-century invention that roots itself in this beloved tradition while insisting on visual individuality. The spelling slows the eye slightly, making the reader linger on a name that might otherwise flash past, demanding a moment of attention — much like a small but irresistible flame.