Nah, "tiaguinho" and "ti" are real nicknames. Only "guinho" is wrong.
You could call him thiagão (big tiago) instead of tiaguinho(little tiago), lol
Still I bet his mom call him tiaguinho, lol. "Ti" also works but you need to be a real close friend/family member or just a girl. I have a cousin named Iiago and I used to call him "Ti" when we were kids but not after we grew up...
Too ing awkward, lol.

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