Iain \ia-in\ as a boy's name is a variant of Ian (Scottish, Hebrew) and John (Hebrew), and the meaning of Iain is "God is gracious".

The baby name Iain sounds like Wain, Win, Eoin, Ion, Ean, Ewin, Eann, Iwan, Jan, Owin, Owain, Wayn and Yann. Other similar baby names are Bain, Cain, Kain, Dain, Fain, Pain, Rain and Zain.