Cognomen Hierl (Hierl 
) , in the entire world, is quite a rare surname. The cognomen Hierl is characteristic of Western Europe, particularly Germany, where it is quite a rare surname, Switzerland, and Austria. Measured by absolute frequency, this name is the most popular in Germany, the United States, and Switzerland.
| VARIANT | COUNTRY |
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| Hierl | Austria, Germany, Spain, United States, Switzerland |
| johann evangelist hierl (b. 1756) |
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| johann eduard hierl (b. 1791) |
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johann baptist hierl German priest and politician (1856-1936), DE (b. 1856) |
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| josef hierl DE (b. 1805) |
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konstantin hierl German politician (1875-1955), DE (b. 1875) |
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josef hierl DE (b. 1881) |
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| michael hierl German politician (1868-1933), DE (b. 1868) |
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| ernst hierl German writer and educationist, DE (b. 1880) |
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| alfred hierl German artist, DE (b. 1910) |
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| rudolf hierl German locksmith, DE (b. 1921) |
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| carl hierl DE (b. 1911) |
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| fritz hierl (b. 1920) |
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| josef hierl German politician, DE (b. 1942) |
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| dr. hubert hierl German politician (b. 1944), DE (b. 1944) |
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| wolfgang hierl DE (b. 1937) |
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