Comments (Meaning / History Only)
No, the source does *not* say that Joris is a corruption of Sjors and Gerard - it's actually the other way around! You misunderstood that part because you're not a native Dutch speaker.
Here is my translation of the explanation provided by your source:
"Variant of George or Gregorius. The name actually originated from Gregorius, but it got confused with George. Joris is also [used] in Frisian, where there are examples of deformation/distortion/transformation [of the name] into Sjors and Gerard."
With that said, I think the journey from Gregorius to Joris went as follows:
Gregorius → Gregoris → Goris → Joris
The change from G- to J- must be a result of influence from Georgius, as that is pronounced with a bit of a j-sound in Dutch:
/ɣe:.'jɔr.ɣi.ʏs/
Also compare the pronunciation of Georgië, which is the Dutch name for the country of Georgia:
/ɣe:.'jɔr.ɣi.jə/
Sources:
• https://nl.forvo.com/search/Georgius/nl/ (in Dutch)
• https://en.wiktionary.org/wiki/Georgië#Dutch (in English)
• https://nl.wiktionary.org/wiki/Georgië (in Dutch)
2
Here is my translation of the explanation provided by your source:
"Variant of George or Gregorius. The name actually originated from Gregorius, but it got confused with George. Joris is also [used] in Frisian, where there are examples of deformation/distortion/transformation [of the name] into Sjors and Gerard."
With that said, I think the journey from Gregorius to Joris went as follows:
Gregorius → Gregoris → Goris → Joris
The change from G- to J- must be a result of influence from Georgius, as that is pronounced with a bit of a j-sound in Dutch:
/ɣe:.'jɔr.ɣi.ʏs/
Also compare the pronunciation of Georgië, which is the Dutch name for the country of Georgia:
/ɣe:.'jɔr.ɣi.jə/
Sources:
• https://nl.forvo.com/search/Georgius/nl/ (in Dutch)
• https://en.wiktionary.org/wiki/Georgië#Dutch (in English)
• https://nl.wiktionary.org/wiki/Georgië (in Dutch)
2
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As a (West) Frisian name, it seems to be a corruption of Sjors and Gerard: "Joris ook in het Fries, daar voorbeelden van vervorming tot Sjors en Gerard."