Names.

JERRY: I haven't vomited in thirteen years.
ELAINE: Get out!
JERRY: Not since June 29, 1980.
ELAINE: You remember the date?
JERRY: Yes, because my previous vomit was also June 29th... 1972. That's why during the '80 vomit, I was yelling to George: "Can you believe it? I'm vomiting on June 29th again."
ELAINE: Boy, you know when Joel told me he hadn't thrown up in eight years, I was wondering if he was normal.
JERRY: Your boyfriend is a normal guy. He just happens to have the same name as one of the worst serial killers in the history of New-York.
ELAINE: Yeah...

Via Sully we see that NPR has an article about what a drag it can be when you share a name with a celebrity (yet makes no mention of the Seinfeld episode, so take from that what you will.)

But for some individuals, it can be a real problem. Sharing names with those who are not so much famous as infamous — porn stars and killers — can be aggravating, especially for job seekers who know prospective employers checking them out online could get the wrong idea.

"In the age of Google, there are a lot more names that look taken than there used to be," says Laura Wattenberg, creator of BabyNameWizard.com. "Even before you're born, someone has stolen part of your identity," she says. "Everybody who hears your name thinks of somebody else."

A coupla years ago HERE I pointed out that I have some experience in this field:

My dad's name was Robert Wilson. And my brother's name is Edmund Wilson. So when it comes to namesakes in my family, we have:
 
Robert Wilson: Nobel Laureate in Physics, partly responsible for discovering the origins of the universe.
Edmund Wilson: the preeminent literary critic of the 20th century and F. Scott Fitzgerald's "intellectual conscience."

and then there's me:
 
Sigh. Of course.