All over the world, Diethelm (Diethelm 
) is quite a rare male first name. The first name Diethelm is characteristic of Germany, where it is quite a rare male name, Switzerland, where it is a rare gender-neutral name, and South Africa, where it is a very rare boy's name. Likewise, Diethelm is the last name as well as the forename.
| VARIANT | COUNTRY |
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| Diethelm | Germany, Switzerland, United States, Poland, France |
| diethelm ii von toggenburg LI (b. 1050) |
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diethelm von krenkingen Roman Catholic bishop (b. 1200) |
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| diethelm v/vi, graf von toggenburg (b. 1150) |
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| diethelm edler herr von steinegg Peerage person ID=673028 (b. 1174) |
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| diethelm freiherr und edler von steinegg Peerage person ID=673041 (b. 1280) |
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| diethelm v of toggenburg Count of Toggenburg (b. 1350) |
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| diethelm vi von toggenburg Count of Toggenburg (b. 1353) |
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| diethelm freiherr von steinegg Peerage person ID=673040 (b. 1411) |
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| diethelm röist Swiss politician, 1482 - 1544, CH (b. 1482) |
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| diethelm blarer von wartensee Abbot of St. Gall (b. 1503) |
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| diethelm heinrich lavater CH (b. 1780) |
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| diethelm lavater (b. 1781) |
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| melchior diethelm CH (b. 1800) |
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| diethelm salomon hofmeister (1814-1893), CH (b. 1814) |
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| diethelm stäbli CH (b. 1812) |
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