Family name Plefka (Plefka 
) , in the world, is a rare cognomen. The family name Plefka is habitual in North Macedonia, where it is quite a rare surname, Austria, where it is a rare surname, and Germany. Measured by absolute frequency, it is the most numerous in North Macedonia, Germany, and the United States.
| VARIANT | COUNTRY |
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| Plefka | Germany, Austria, North Macedonia, United States, Brazil |
| jan christoph plefka German university teacher, DE (b. 1968) |
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| mark plefka college basketball player (1975–1978) Fairfield |
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| jon plefka college basketball player (2003–2007) James Madison; Texas Tech |
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Mr, Marli, Susan, Argel, Chloe, Craig, Brian, Bruna, Karen, Karly, Kelly, Paulo, Peter, Ruthe, Diana, Georg, Lauro, Lucia, Lucas, Lukas, James, Jason, Marta, Maria, Ilda, Timm, Ms, Sue, Ana, Ann, Amy, Dan, Jan, Jon, Jen, Tom, Julio, Uwe, Mike, Alex, Brad, Dave, Dawn, Lori, John, Joan, Joao, Joel, Mark, and Tonya