Christianus

Christianus is commonly used in the Dutch-speaking world, though primarily as an official name on birth certificates: in daily life, bearers will typically go by a more practical derivative, such as Chris and Christia(a)n.

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In Dutch, Christianus is pronounced as: /krɪs.ti.'ja:.nʏs/

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With that said, the name has also seen some use in Scandinavia, but not to the same extent, i.e. it's extremely rare over there.

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Sources:
• https://www.nordicnames.de/wiki/Christianus (in English)
• https://nvb.meertens.knaw.nl/naam/is/Christianus (in Dutch; shows the prevalence of the name in the Netherlands in 2017)
• http://www.names.be/voornamen.html?met=Christianus&sort=beldesc (in Dutch; shows the prevalence of the name in Belgium in 2009)
• (general): https://www.linkedin.com/pub/dir/?first=Christianus&last=&search=Zoeken
• Christianus Carolus Henricus van der Aa (1718-1793): https://en.wikipedia.org/wiki/Christianus_Carolus_Henricus_van_der_Aa (in English)
• Christianus Cornelis Uhlenbeck (1866-1951): https://en.wikipedia.org/wiki/C._C._Uhlenbeck (in English)
• Christianus Druve (1573-1636): https://nl.wikipedia.org/wiki/Christianus_Druve (in Dutch)
• Christianus Engelenberg (1810-1888): https://nl.wikipedia.org/wiki/Christianus_Engelenberg (in Dutch)
• Christianus Joannes Antonius Heydenrijck (1832-1911): https://nl.wikipedia.org/wiki/Christianus_Joannes_Antonius_Heydenrijck (in Dutch)
• Christianus "Chris" de Bont (b. 1951): https://nl.wikipedia.org/wiki/Chris_de_Bont (in Dutch)
• Christianus "Chris" Matser (1904-1973): https://nl.wikipedia.org/wiki/Chris_Matser (in Dutch)
• Christianus "Chris" Walder (1900-1997): https://nl.wikipedia.org/wiki/Chris_Walder (in Dutch)
• Christianus "Christiaan" Boers (1889-1942): https://en.wikipedia.org/wiki/Christiaan_Boers (in English)
• Christianus "Christiaan" Houben (1824-1900): https://nl.wikipedia.org/wiki/Christiaan_Houben (in Dutch) [noted -ed]