World Champion.
Here is a quote about Khimari's Spirit Lance ( I will be posting the link where I found this so you can see for yourself).
"Name origin: Just a silly name cooked up by Square's translators after eating
too much Pocky. In the Japanese FFX, Kimahri's ultimate weapon was called
Longinus, which is the name of the Roman soldier who pierced Christ's side
with his spear. The metaphor of a spear that could pierce the divine is lost
in the English translation, sadly. RIP Longinus, we barely knew ye."
It was Khimari's Spirit Lance, not World Champion. Here is what is said about Wakka's (Which is the World Champion).
"Name origin: Most of Wakka's weapons have sport-related names, so since you
essentially need to become the Blitzball World Champion to obtain this, it's
self-explanatory. "
Look in here for the information:
http://www.gamefaqs.com/console/ps2/file/197344/14321