Cognomen Blackhart (Blackhart 
) , in the entire world, is a very rare last name. The cognomen Blackhart is habitual in Northern America, particularly the United States, where it is a very rare surname, and Canada, where it is an extremely rare surname. Much less frequently, Blackhart is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Blackhart | United States, Canada |
Marc, James, Ellen, Hazel, Steven, Andrew, Claire, Robert, Jayson, Jaycie, Trevor, Elysia, Maryann, Allyson, Annette, Charles, Brandon, Breanna, Killian, Kristan, Ginette, Jeffrey, Logan, Laura, Debra, Raven, Mark, Mike, Bari, Brad, Bret, Rick, Ryan, Dani, Gary, Lisa, Adrienne, Lynn, Jean, Jeff, Tori, Steve, Scott, Cloud, Craig, Brian, Bruce, Kevin, John, and Kasandra