The senator from Ohio introduced himself to the world in 2016 when he published his bestselling memoir, “Hillbilly Elegy,” under the name J.D. Vance — “like jay-dot-dee-dot,” he wrote, short for James David. In the book, he explained that this was not the first iteration of his name. Nor would it be the last.

Over the course of his 39 years, Vance’s first, middle and last names have all been altered in one way or another. Since Vance was first introduced to the country as Donald Trump’s running mate, his name has been the source of both curiosity and questions — including why he no longer uses periods in JD.

He was born James Donald Bowman in Middletown, Ohio, on Aug. 2, 1984, his middle and last names the same as his biological father, Donald Bowman. His parents split up “around the time I started walking,” he writes. When he was about 6, his mother, Beverly, married for the third time. He was adopted by his new stepfather, Robert Hamel, and his mother renamed him James David Hamel.

When his mother erased Donald Bowman from his and her lives, the adoption process also erased the name James Donald Bowman from the public record. The only birth certificate for Vance on file at Ohio’s vital statistics office reads James David Hamel, according to information provided by the state.

Beverly kept the boy’s initials the same, since he went universally by J.D., Vance explains in the book. He didn’t buy his mother’s story that he was named for his uncle David, though. “Any old D name would have done, so long as it wasn’t Donald,” he wrote.

Vance spent more than two decades as James David “J.D.” Hamel. It’s the name by which he graduated from Middletown High School, served in Iraq as a U.S. Marine (officially, Cpl. James D. Hamel), earned a political science degree at The Ohio State University and blogged his ruminations as a 26-year-old student at Yale Law School. Those facts are borne out in documentation provided by those entities upon request, or otherwise publicly available, and were confirmed by campaign spokesperson Taylor Van Kirk.

But the situation gnawed at him, particularly after his mother and adoptive father divorced.

“I shared a name with no one I really cared about (which bothered me already), and with Bob gone, explaining why my name was J.D. Hamel would require a few additional awkward moments,” he writes in “Hillbilly Elegy.” “Yeah, my legal father’s last name is Hamel. You haven’t met him because I don’t see him. No, I don’t know why I don’t see him. Of all the things that I hated about my childhood, nothing compared to the revolving door of father figures.”

So he decided to change his name again, to Vance — the last name of his beloved Mamaw, the grandmother who raised him.

It didn’t happen on his wedding day in 2014, as the book implies, but in April 2013, as he was about to graduate from Yale, Van Kirk said. It felt right to take the name of the woman who raised him before dying in 2005, as he was putting the struggles of his early life behind him and launching into this new phase.

“Throughout his tumultuous childhood, Mamaw — or Bonnie Blanton Vance — raised JD and was always his north star,” Van Kirk said in a statement. “It only felt right to him to take Vance as his last name.”

Claiming the Vance name also served to tie JD more clearly to what he writes was “hillbilly royalty” on his grandfather’s side not long before he would release a book opining on hillbilly culture. A distant cousin to his Papaw, also named James Vance, married into the McCoy-hating Hatfield family and committed a murder that “kicked off one of the most famous family feuds in American history,” Vance wrote in his book.

Vance achieved a clean slate of sorts with his new name, just as he was entering his career as a lawyer and author. Besides being the name on his book, it’s the name he used to register for the bar, to marry, to enter the world of venture capital in the Silicon Valley and as he became a father.

But there was one more name alteration to come.

When Vance jumped into politics in July 2021, he had removed the periods from J.D. He’d often used this shorthand, JD, over his lifetime.

Asked by The Associated Press at the time if this was a formal change, or merely stylistic, his campaign said it was how Vance preferred to be referred to in print. He has maintained the usage as a U.S. senator, referring to himself as JD Vance on his Senate website, in press releases and in certain campaign and business filings.

The nominee’s legal name today is James David Vance. The AP, whose industry-standard AP Stylebook advises to generally call people by the name they prefer, honors his request to go by JD with no periods.

A version of this story originally published on Fortune.com on July 26, 2024.