Stefan

Also used in Ukrainian sometimes. It's generally used more towards Western Ukraine due to Polish influence. It is also occasionally used by Greek-Ukrainians in Eastern and Southern Ukraine.

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Stefan Biletskyy, father of the researcher and political scientist Volodymyr Biletskyy.
https://uk.m.wikipedia.org/wiki/%D0%91%D1%96%D0%BB%D0%B5%D1%86%D1%8C%D0%BA%D0%B8%D0%B9_%D0%92%D0%BE%D0%BB%D0%BE%D0%B4%D0%B8%D0%BC%D0%B8%D1%80_%D0%A1%D1%82%D0%B5%D1%84%D0%B0%D0%BD%D0%BE%D0%B2%D0%B8%D1%87#:~:text=%D0%91%D1%96%D0%BB%D0%B5%D1%86%D1%8C%D0%BA%D0%B8%D0%B9%20%D0%A1%D1%82%D0%B5%D1%84%D0%B0%D0%BD%20%D0%9F%D0%B5%D1%82%D1%80%D0%BE%D0%B2%D0%B8%D1%87

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Stefan Batyushko, Ukrainian politician (ethnic Belarusian but I don't believe Stefan is a Belarusian name)
https://uk.m.wikipedia.org/wiki/%D0%91%D0%B0%D1%82%D1%8E%D1%88%D0%BA%D0%BE_%D0%A1%D1%82%D0%B5%D1%84%D0%B0%D0%BD_%D0%92%D0%B0%D1%81%D0%B8%D0%BB%D1%8C%D0%BE%D0%B2%D0%B8%D1%87

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Stefan Romaniv, Ukrainian politician from Australia
https://uk.m.wikipedia.org/wiki/%D0%A1%D1%82%D0%B5%D1%84%D0%B0%D0%BD_%D0%A0%D0%BE%D0%BC%D0%B0%D0%BD%D1%96%D0%B2

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Stefan Semchuk, Ukrainian-born Canadian poet, journalist, and religious figure
https://uk.m.wikipedia.org/wiki/%D0%A1%D0%B5%D0%BC%D1%87%D1%83%D0%BA_%D0%A1%D1%82%D0%B5%D1%84%D0%B0%D0%BD

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Stefan Taranushenko, Ukrainian professor, architecture expert, art critic
https://uk.m.wikipedia.org/wiki/%D0%A2%D0%B0%D1%80%D0%B0%D0%BD%D1%83%D1%88%D0%B5%D0%BD%D0%BA%D0%BE_%D0%A1%D1%82%D0%B5%D1%84%D0%B0%D0%BD_%D0%90%D0%BD%D0%B4%D1%80%D1%96%D0%B9%D0%BE%D0%B2%D0%B8%D1%87

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Stefan Terletskyy, Ukrainian born British politician
https://uk.m.wikipedia.org/wiki/%D0%A2%D0%B5%D1%80%D0%BB%D0%B5%D1%86%D1%8C%D0%BA%D0%B8%D0%B9_%D0%A1%D1%82%D0%B5%D1%84%D0%B0%D0%BD_%D0%9E%D0%BB%D0%B5%D0%BA%D1%81%D1%96%D0%B9%D0%BE%D0%B2%D0%B8%D1%87

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Stefan Yampolskyy, Ukrainian economist
https://uk.m.wikipedia.org/wiki/%D0%AF%D0%BC%D0%BF%D0%BE%D0%BB%D1%8C%D1%81%D1%8C%D0%BA%D0%B8%D0%B9_%D0%A1%D1%82%D0%B5%D1%84%D0%B0%D0%BD_%D0%9C%D0%B8%D1%85%D0%B0%D0%B9%D0%BB%D0%BE%D0%B2%D0%B8%D1%87

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Stefan Kozak (Polish-Ukrainian)
https://uk.m.wikipedia.org/wiki/%D0%9A%D0%BE%D0%B7%D0%B0%D0%BA_%D0%A1%D1%82%D0%B5%D1%84%D0%B0%D0%BD_%D0%9F%D0%B5%D1%82%D1%80%D0%BE%D0%B2%D0%B8%D1%87

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Stefan Kaloyerov (Greek-Ukrainian)
https://uk.m.wikipedia.org/wiki/%D0%9A%D0%B0%D0%BB%D0%BE%D1%94%D1%80%D0%BE%D0%B2_%D0%A1%D1%82%D0%B5%D1%84%D0%B0%D0%BD_%D0%9E%D0%BB%D0%B5%D0%BA%D1%81%D1%96%D0%B9%D0%BE%D0%B2%D0%B8%D1%87

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Ukrainian Wikipedia on Stefan
https://uk.m.wikipedia.org/wiki/%D0%A1%D1%82%D0%B5%D1%84%D0%B0%D0%BD

Also has uncommon Russian usage:
https://ru.wiktionary.org/wiki/%D0%A1%D1%82%D0%B5%D1%84%D0%B0%D0%BD

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/w4LMY94JM2l
Https://www.portraitarchiv.ch/portrait?page=116
Http://www.annalas.ch/persunas/display/q:Stefan

Also Albanian: https://instatemra.shinyapps.io/emra/

Also Cornish: https://www.cornwall.gov.uk/media/21532021/personal-names.pdf
https://kw.wikipedia.org/wiki/Rol_a_Babow_an_Eglos_Katholik_Romanek -- Pope Stephen = Pab Stefan

Also used in Estonia: https://et.wikipedia.org/wiki/Stefan

Also Breton: https://br.wikipedia.org/wiki/Stefan
http://www.meilleursprenoms.com/stats/prenoms_stat.php/Stefan

Add Usage: Finnish, English

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Pronounced: STEH-fan (Swedish, Dutch, Polish), STEH-fahn (Finnish), STEHF-ən (English)

The name Stefan was given to 263 boys born in the US in 2016.
More than 99.9 percent of people with the first name Stefan are male.

Also a boys name in Slovenia.

Pretty common in Sweden, not popular for boys today. Steffe is a common nick name.