Gracious
Eian is a modern phonetic spelling of Ian, which is the Scottish Gaelic form of John. It ultimately derives from the Hebrew name Yochanan, signifying that the divine has shown favor.
Less common today
Eian isn't in the latest US Top 1000. It last peaked at #1,404 in 2012.
US births per 5-year period, 1990βpresent (SSA data).