Victorius

The name is wonderful, but would come across as pretentious in English. You'd be better off with Victor.

It would be embarrassing to lose a match or competition with a name like this.

"Victorius"... A very strong, masculine name. While my opinion is summed up decently in those past few words-- I think that, in this age, in the United States-- it would be interpreted horribly wrong. It would be seen as an ornate, pretentious, "stuck-up" name that bears oh-so too much resemblance to the word "Victorious." Thus... unusable, unfortunately or not.