Ionn is a variant of Ian (English, Scottish, and Gaelic).
Ionn is also a variant of Ion (Basque and Romanian).
Ionn is uncommon as a baby name for boys. It is listed outside of the top 1000 names. In 2012, among the group of boy names directly related to Ionn, Ian was the most frequently used.
Baby names that sound like Ionn include Iham, Ihan (English), In Ho (Korean), Ina, Inam (Arabic), Ion (Basque and Romanian), Ione, Ionne, Aagney, Aamin (Indian), Aanan, Addin, Ahsen, Ahsin, Ahsun, Aiman, Aimé (English and French), Almyn, Aman (Arabic and English), and Ameen (Arabic and East Indian).
† approx English pronunciation for Ionn: AY as in "side (S.AY.D)" ; AH as in "mud (M.AH.D)" ; N as in "knee (N.IY)"