In the entire world, Doppelt (Doppelt 
) is an extremely rare masculine first name. Much more frequently, Doppelt is the last name as well as the forename.
Mr, Beth, Brad, Kara, Kate, Kyle, Paul, Phyl, Ross, Roni, Ryan, Dani, Gary, Gabe, Leah, Liza, Lori, Jack, Josh, Joel, Jean, Jeff, Cela, Jill, Cory, Adam, Ms, Jo, Max, Sam, Ali, Amy, Ava, Ben, Bob, Ray, Roy, Gil, Lee, Ira, Zvi, Matt, Sara, Samy, Sagi, Alan, Anne, Adiy, and Noah