My husband doesn't like this name at all unfortunately, he says it sounds like a Disney villain's name, and that it reminds him too much of the parrot's name from Aladdin haha, oh well (I still like it).
This might be my favorite name for a boy, it's very handsome and adventurous feeling. It's likely most people in America will mispronounce it but it's too gorgeous a name for me to care, Tiago is wonderful and after my husband's family name Iglesias was anglicized to 'English' when his grandpa came to the states we like the idea of using a Portuguese or Spanish language name for a son.
This is possibly one of the few Portuguese masculine names I like, if your name is Tiago and you're going to present yourself to English speakers, I think "Jim" it's a great nickname. I dislike the Brazilian spelling "Thiago" tho.