Tiago is pronounced tee-A-goo (or chee-A-goo if you are Brazilian, but I prefer the former). The -goo part is sounded lightly, not like the English "goo". You can listen to it here:
http://www.forvo.com/word/tiago/#pt
It's a Portuguese form of
James, and is surprising popular in
France at the minute. WDYT of it?
Edited to add Forvo link.
This message was edited 10/30/2012, 10:57 AM