Family name Seyfang (Seyfang 
) , around the globe, is a rare cognomen. The family name Seyfang is habitual in Germany, where it is a rare surname, Switzerland, and Australia. Not in comparison with a country's population, the name is most common in Germany, the United States, and Australia.
| VARIANT | COUNTRY |
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| Seyfang | Germany, Spain, Australia, Switzerland, United States |
| frank george seyfang pioneer balloonist who developed the windsock balloon (1890-1963), US (b. 1890) |
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| leonhard seyfang researcher |
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| kelsey e seyfang researcher, ORCID id # 0000-0003-1952-6697 |
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| andreas seyfang researcher (ORCID 0000-0001-6231-9955) |
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Mr, John, Tony, Todd, Ella, Emma, Evan, Hans, Opal, Margo, Jana, Mandy, Silas, Susan, Sonja, Stacy, Scott, Allen, Anita, Kelly, Kevin, Megan, Lyle, Lisa, Gill, Ms, Ann, Rae, Roy, Dan, Jan, Tim, Uwe, Marc, Mary, Mark, Matt, Sean, Skip, Abby, Brie, Bita, Karl, Kris, Paul, Rick, Klaus, and Peter