Cognomen Fronius (Fronius 
) , throughout the world, is a rare surname. The last name Fronius is habitual in Estonia, where it is quite a rare surname, Austria, where it is a rare surname, and Germany. In absolute terms, the name is most common in Germany, the United States, and Austria.
| VARIANT | COUNTRY |
|---|---|
| Fronius | Austria, United States, Germany, Estonia, Romania |
| andreas fronius Stadtrichter (b. 1500) |
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| matthias fronius Lutheran cleric and magistrate, RO (b. 1522) |
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| peter fronius RO (b. 1572) |
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| marcus fronius theologian, RO (b. 1659) |
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| michael fronius RO (b. 1675) |
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| andreas fronius RO (b. 1714) |
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| michael traugott von fronius (b. 1727) |
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| martin gottlieb fronius RO (b. 1743) |
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| michael traugott fronius AT (b. 1761) |
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| franz friedrich fronius Romanian botanist (1829-1886), RO (b. 1829) |
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| karl josef fronius (b. 1841) |
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| robert fronius AT (b. 1868) |
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sigrid fronius German journalist and writer, DE (b. 1942) |
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| hans fronius Austrian artist (1903-1988), AT (b. 1903) |
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| günter fronius Romanian businessman, AT (b. 1907) |
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Mr, Jean, Jeff, Todd, Neal, Hans, Maria, Marna, Maddi, Molly, John, Silas, Artur, Adina, Carli, Claus, Bernd, Brian, Kelli, Klaus, Petra, Susan, Jack, Jane, Lena, Ms, Tj, Mae, Dan, Jan, Joe, Jim, Matt, Sara, Sven, Alex, Ante, Anke, Adam, Kari, Kuno, Ralf, Ryan, Dawn, Doug, Lars, Peter, and Ralph