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Globally, Seybert (Seybert , Сеиберт ) is a very rare masculine first name. Much more frequently, Seybert is the last name as well as the forename.
Сейберт
Ed, Eva, Val, Ian, Marc, Mary, Mark, Matt, Mike, Tim, Sara, Alex, Alan, Andy, Anna, Anne, Arla, Adam, Addi, Stan, Tom, Taj, Jim, Sam, Sue, Ann, Amy, Bev, Bob, Kay, Ken, Kim, Pam, Ray, Rae, Roy, Don, Lee, Liz, Jan, Jon, Joe, Chad, and Chet