George Costanza has never celebrated Festivus and doesn’t wear velvet, but does own a puffy jacket. Liz Lemon is a workaholic in her 40s with a boyfriend called Pete and a neighbor named Jenna. And Don Draper doesn’t drink or smoke, but his wife is Elizabeth Draper.

The one thing they all have in common: They are real-life people living with the names of famous New York City characters.

“It’s almost rare that someone doesn’t comment,” said Annie Hall, 65, an Upper East Sider who happily embraced husband John Hall’s surname after they wed in 2007, despite the constant attention it brings. “If you married Madoff, you’d be pretty unhappy,” Hall said.

For years, teenage girls prank-called the Constanza home in Buffalo, claiming to be Elaine. A pizza shop refused to make a delivery order because workers thought they were being “Punk’d.” If the retired construction worker, 87, got to pick, he’d rather share his name with Jerry Seinfeld.

“He seems to be the smartest,” Constanza said.

An avid “Mad Men” fan, the real Draper, 59, describes himself as “pretty much the opposite” of the show’s hard-partying Lothario.

“I would not want to switch places with the fictional character that Jon Hamm plays,” the Atlanta resident said.

Lemon 42, of Boston, finds terrifying similarities between herself and the hilariously dorky character Tina Fey portrayed in “30 Rock.”

“I’m very focused on my job and sometimes forget to check if I’m wearing matching clothes,” Lemon laughed.

Lemon had to abandon her lizlemon@gmail.com e-mail account after it became flooded with spam, thanks to “30 Rock” fans using it when they signed up for online sites like Tumblr and Pinterest.

But the biggest burden of sharing a famous name is the constant conversations — which get old — about it.

“I always like it when I meet someone who’s never seen the show and has no idea what this name means,” said Lemon.

Hannah Horvath, 22, from Danbury, Conn., is an NYC teacher just like Lena Dunham’s character on HBO’s hit show “Girls,” but she’s not a fan of the fictional Horvath, who is self-absorbed, engages in terrible sex and is usually unemployed.

“I was kind of like ‘You’re being the voice of our generation? Stop whining, get a job,’ ” Horvath said of Dunham.

But if you are seeking online anonymity, a famous name is the way to go.

“It’s kind of hard to find me in a sea of Hannah Horvaths that have to do with HBO,” said the young teacher from Connecticut.

Lemon has had a similar experience. “I googled Liz Lemon and took a screenshot: 4.5 million hits,” she said.