Cognomen Demchak (Demchak 
) , globally, is a rare surname. The cognomen Demchak is habitual in Hungary, where it is quite a rare surname, New Zealand, where it is a rare surname, and the United States. In absolute terms, it most frequently occurs in the United States, Hungary, and Canada.
| VARIANT | COUNTRY |
|---|---|
| Demchak | Russia, United Kingdom, Hungary, United States, Canada |
| maryann demchak special education researcher (b. 1957) |
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| william s. demchak business executive in the finance industry (b. 1963) |
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| barry demchak researcher |
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| greg demchak (b. 1974) |
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Mr, Anne, Adam, Carl, Cory, Brad, Paul, Rose, Rich, Rick, Rita, Ryan, Dana, Dane, Dave, Dawn, Gary, Greg, Lisa, Lori, Lora, Lois, Anna, Lynn, Andy, Alan, Ed, Sam, Ann, Amy, Ben, Bob, Ken, Kim, Dan, Len, Joe, Jen, Jim, Tom, Mary, Mark, Maya, Maol, Mike, Sean, Alex, Ally, and Jana