Wolverine is (arguably) the most successful knockoff character of all time, largely because the fine folks at Marvel worked hard to set their character apart from Lone Wolf/Timber Wolf, the DC character that inspired Wolvie.
However, the company's overuse of the character in the 80s and 90s led to an overabundance of knockoff characters created for storylines involving Wolverine, such as Shiv, Wild Child, Daken, Romulus and Wild Thing.
Since Wild Thing and Daken are technically Wolvie's kids they don't really count as knockoffs, but Shiv is the spitting image of Logan without the mask and has one claw on each hand instead of three.
But any savage comic character can be considered akin to Wolverine, so the feral characters Wild Child and Romulus, and the Liefeld character Feral for that matter, share that connection to him.
In fact, both Wild Child and Romulus are said to have a genetic connection to wolves, which conveniently brings us back to Timber Wolf...
See The Second Best There Is At What They Do: 16 Wolverine Knockoffs here