Iago \i(a)-go\ as a boy's name is of Spanish and Welsh origin. Variant of James (Hebrew) "he who supplants". Santiago, the Spanish name for Saint James, was given to several geographical places in South America and the capital city of Chile. Literary: name of the villain in Shakespeare's "Othello".
Iago has 2 variant forms: Jago and Yago.
For more information, see also related names Jacob and Yaakov.