Family name Rönn (Reynir 
, Rönn 
) , all around the world, is quite a rare surname. The last name Rönn is characteristic of Northern Europe, particularly Sweden, where it is quite a rare surname, Iceland, and Finland. In absolute terms, it most frequently occurs in Sweden, Germany, and Finland. Much less frequently, Rönn is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Reynir | Philippines, Iceland, United States, China, Denmark |
| Rönn | Brazil, Sweden, United States, Finland, Germany |
| hans ludwig karl rönn botanist (b. 1886) |
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| ove rönn Swedish musician, SE (b. 1911) |
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| günter schlichting-von rönn German politician (1914-1976), DE (b. 1914) |
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| peter von rönn (b. 1940) |
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| kenth rönn Swedish bobsledder, SE (b. 1953) |
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| liliane von rönn DE (b. 1949) |
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| jyri rönn Finnish ice hockey official, FI (b. 1971) |
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| minttu rönn researcher |
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| john rönn researcher ORCID ID = 0000-0001-5492-889X |
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| tina rönn researcher |
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| roger e rönn researcher |
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| helga rönn Swedish suffragist, SE |
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| heiner von rönn |
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| cecilia rönn SE (b. 1980) |
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| peter von rönn |
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Anu, Jens, Jere, Juha, Tage, Tina, Nina, Ella, Erik, Emil, Emma, Hans, Vesa, Isak, Outi, Otto, Åsa, Maria, Marie, Marco, Marko, Milla, Joel, Jari, Jami, Lena, Kay, Kim, Pia, Jan, Flo, Ida, Ola, Ove, Ulf, Mike, Mirja, Mika, Satu, Anna, Anne, Anja, Adam, Agne, Karl, Pasi, Lars, Leif, Sara, and Mikko