from Wiktionary, Creative Commons Attribution/Share-Alike License
- proper n. A male given name.
from The Century Dictionary and Cyclopedia
- n. A form of -an, being -an preceded by an original or euphonic vowel i-. See -an.
An anglicisation of Eóin, the Gaelic equivalent of the name John. The name originated in Ireland, and was taken from there to Scotland, where the modern form Iain co-exists with it. In Ireland it was largely supplanted by the later forms Seaan, Seón, and Seóan, of which the modern form is Seán (anglicised as Sean). (Wiktionary)