I'm not Italian and therefore I might be wrong, but I believe that your player name should be pronounced "Chee-chee" [most definitely not "Seekchee" or "Cheekchee"]. To be honest, Chi-chi would probably make more sense to me, but for an American, I would say that Chee-chee is probably more accurate.
Sound "Ch" shouldn't be pronounced as hard as it's pronounced in words such as "Chuck" and "Cheese", though, but a bit softer. Perhaps something like "Ch" in "Chimney".