In the world, Heffernen (Heffernen 
) is an extremely rare unknown gender first name. Predominantly, Heffernen is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Heffernen | New Zealand, Canada, United States, Australia |
Sam, Irene, Steven, Ashley, Cheryl, Robert, Deanna, Daniel, Danica, Dalton, Donnie, Leslie, Joshua, Jorrie, Thomas, Nicole, Virgil, Matthew, Melissa, Michael, Shaniqa, Stephen, Emily, James, Jacob, Laura, Dan, Liz, Jim, Fay, Mark, Sara, Cara, Kyle, Paul, Doug, Brianna, John, Molly, Megan, Susan, Steve, Carol, Beata, Peter, Renee, Debra, Dylan, Mandy, and Richard