Surname Arnoldi (Arnoldi 
, Арнольди 
, ארנולדי 
) , worldwide, is quite a common last name. The surname Arnoldi is habitual in Italy, where it is quite a rare surname, Denmark, and Switzerland. Not in comparison with a country's population, it most frequently occurs in Italy, Indonesia, and Germany. Much less frequently, Arnoldi is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Arnoldi | Italy, France, United States, Indonesia, Germany |
| Арнольди | Russia |
| ארנולדי | Israel |
| Арнолди | Armenia, Russia |
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alberto arnoldi Italian artist, FR (b. 1350) |
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| bartholomæus arnoldi Augustinian friar, DE (b. 1465) |
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| lazarus arnoldi 1531-1605; geboren in Halberstadt, Sohn des Schuldieners und Organisten Author Arnoldi, Student an der Univ. Wittenberg, Pfarrer und Superintendent in Schöningen, verheiratet mit Dorothea Arnoldi (b. 1531) |
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johannes arnoldi German father, DE (b. 1596) |
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nicolaus arnoldi PL (b. 1618) |
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| henricus arnoldi (b. 1575) |
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| philipp arnoldi (b. 1582) |
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| daniel arnoldi German educationist, DE (b. 1595) |
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| johann arnoldi German jurist, DE (b. 1648) |
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| johann conrad arnoldi German librarian and theologian, DE (b. 1658) |
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| michael arnoldi NL (b. 1658) |
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| georg heinrich arnoldi DE (b. 1675) |
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| ernst christoph arnoldi German university teacher and writer (1696-1744), DE (b. 1696) |
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albert jakob arnoldi German theologian, DE (b. 1750) |
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| valentin arnoldi (b. 1712) |
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