There's the Mendoza Line, named after Mario Mendoza, known for not having a great Batting Average.
In NASCAR racing drivers celebrate their win by doing a Kulwicki Lap, named after Alan Kulwicki. This is sometimes known as the Polish Victory Lap. I call it, and have heard commentators call it, the Kulwicki Lap. I'm sticking with it.
Dipping into the medical side of sports there's Tommy John surgery (ulnar collateral ligament reconstruction) and Lou Gehrig's disease (amyotrophic lateral sclerosis).
There are events that are specific to a single incident, such as Merkle's Boner. Doesn't fit the category. That was a one time event.
Then there are the trophies. The Lombardi Trophy. The Stanley Cup. The Heisman Trophy. Etc, etc. Those don't count either.
Who's name in sports am I missing? Mulligan? Tebowing?