Arnold

Also Norwegian, Swedish and Danish.

Also Albanian.

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In Albania Arnold was #3 for newborns in 2000.

Also Czech:

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https://cs.m.wikipedia.org/wiki/Arnold
https://cs.m.wiktionary.org/wiki/Arnold

Also Romansh:
Source: "Vornamen in der Schweiz. Prénoms en Suisse. I nomi in Svizzera. Prenoms in Svizra" (1993) published by the Association of Swiss registrars
Https://nossaistorgia.ch/entries/w4LMYKw8V2l
Https://nossaistorgia.ch/entries/m3zVp9rGD8d
Https://nossaistorgia.ch/entries/v78VqApnVW4
Https://www.portraitarchiv.ch/portrait?page=217
Http://www.annalas.ch/persunas/display/q:Arnold

Also Hungarian:

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https://hu.m.wikipedia.org/wiki/Arnold_(keresztn%C3%A9v)
https://www.behindthename.com/name/arnold/top/hungary

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Also Slovak: https://sk.m.wikipedia.org/wiki/Arnold

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Also Romanian: https://forebears.io/forenames/arnold

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Also Norwegian, Danish and Swedish; being most popular in the 1920's: https://www.nordicnames.de/wiki/Arnold

Also Luxembourgish: http://www.actioun-letzebuergesch.lu/virnimm.html
https://lb.wikipedia.org/wiki/Arnold_Kieffer

Also Estonian: https://et.wikipedia.org/wiki/Arnold_(eesnimi)

Arnold is also used in the country of Georgia, though it is extremely rare there... and always has been. It is written as არნოლდ in Georgian.

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The best known Georgian bearer was the linguist and philologist Arnold Chikobava (1898-1985): https://en.wikipedia.org/wiki/Arnold_Chikobava (in English).

Also Polish: https://pl.wikipedia.org/wiki/Arnold_(imi%C4%99)
https://pl.wiktionary.org/wiki/Arnold [noted -ed]

Also Kashubian: https://csb.wikipedia.org/wiki/18_l%C3%ABpi%C5%84ca

Also Slovak: https://sk.wikipedia.org/wiki/Arnold

According to howmanyofme.com, there are 60 people in the U.S. named Arnold Arnold.

In 2018, 63 is the most common age for an American (U.S.) Arnold who is registered male with the Social Security Administration. It is the 701st most common male first name for living U.S. citizens.

Also a Hungarian name. Pronounced: AWR-nold.

The name Arnold was given to 95 boys born in the US in 2015.

The name Arnold was given to 88 baby boys born in the US in 2012.

This is a Polish variant, too.