Family name Gelhar (Gelhar 
) , across the world, is a rare surname. The cognomen Gelhar is characteristic of Germany, where it is a rare surname, Finland, and the United States, where it is a very rare surname. In absolute terms, it most frequently occurs in the United States, Germany, and India. Very seldom, Gelhar is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Gelhar | Australia, Germany, Finland, United States, India |
| paul gelhar holocaust victim, b. 1887-07-20, PL (b. 1887) |
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| hertha gelhar holocaust victim, b. 1894-07-07, DE (b. 1894) |
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| hans stephan gelhar holocaust victim, b. 1929-04-29, DE (b. 1929) |
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| lynn walter gelhar Ph.D. University of Wisconsin-Madison 1964 |
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| lynn gelhar American civil engineer |
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Mr, Rolf, Rick, Rita, Ruth, Dave, Dale, Gary, Greg, Leah, Rosi, Lisa, Lucy, Lynn, Jack, Jake, John, Jody, Jean, Troy, Edna, Lori, Ralf, Paul, Kyle, Ms, Amy, Kim, Pat, Leo, Jay, Jen, Jim, Tom, Mary, Mark, Mike, Scot, Sven, Alex, Alan, Chad, Cole, Barb, Beth, Brad, Eric, and Erik