Gracious
Iaan is a rare variant of Ian, which is the Scottish form of the name John. It ultimately derives from the Hebrew name Yochanan, signifying the benevolence of a deity. This specific double-a spelling is highly unusual and provides a modern, visual twist on a deeply traditional name.
Less common today
Iaan isn't in the latest US Top 1000. It last peaked at #5,295 in 2016.
US births per 5-year period, 1990βpresent (SSA data).