The fused mutant weapon created by Stryker in X-Men Origins: Wolverine is designated Weapon XI.
The film presents Weapon XI as a heavily modified mutant assembled by William Stryker. Its abilities include superhuman strength, rapid movement, energy projection, teleportation, and retractable blades. Stryker describes the creation as a weapon built from the powers of several mutants.
The character is also identified as Wade Wilson after his transformation. This version becomes the film’s final opponent for Wolverine, although it differs substantially from the wisecracking Deadpool seen in the 2016 film.
Weapon X is a separate designation associated with Wolverine’s adamantium procedure, so the two names are not interchangeable. Weapon XI is the label used for the later fused weapon in this film’s storyline.