Otto

Also Polish, Czech and Slovak.

It is also used as nickname for Ottokar and Ottomar.
The name of my dad was Ottomar.
I knew him only as Otto in my first years of life.
When I realized that his real name was Ottomar I found this name odd.

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://sursassiala.ch/2015/01/15/familienforschung/
Https://nossaistorgia.ch/entries/zmkMAA12MrN
Https://nossaistorgia.ch/entries/v78VqApnVW4
Https://www.portraitarchiv.ch/portrait?page=139
Http://www.annalas.ch/persunas/display/q:Otto

Also Latvian: https://personvardi.pmlp.gov.lv/index.php?name=Otto

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Also Slovak: https://forebears.io/forenames/otto

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Also Czech:

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https://www.behindthename.com/name/otto/top/czech
https://cs.m.wiktionary.org/wiki/Otto
https://cs.m.wikipedia.org/wiki/Oto - listed as a variant

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

Also Polish: https://pl.wikipedia.org/wiki/Otto
https://pl.wiktionary.org/wiki/Otto

Add Usage: Italian

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Pronounced: UWT-to (Swedish), O-do (Danish), AHT-o (American English), AWT-o (British English), OT-to (Finnish, Italian)

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Another notable bearer is the father of Anne Frank (1929-1945) and only surviving member of the Frank family during the Holocaust, Otto Frank (1889-1980).

In 2018, 80 is the most common age for an American (U.S.) Otto who is registered male with the Social Security Administration. It is the 1, 967th most common male first name for living U.S. citizens.