Gracious
Iyon is a rare phonetic variant of Ian or Ion, which are themselves derivatives of the Hebrew name Yochanan (John). It signifies the favor and grace of a deity, though its specific spelling is modern and uncommon in the United States.
Less common today
Iyon isn't in the latest US Top 1000. It last peaked at #7,930 in 2017.
US births per 5-year period, 1990βpresent (SSA data).