According to https://www.meertens.knaw.nl/nvb/verklaring/naam/Jorrit, this is a Frisian form of Everhard (or Everfried): "Friese vorm van Everhard (vergelijk Gerrit uit Gerhard) of van Ever-fried (vergelijk Juerd en Jurryt)" Rosa and Volker Kohlheim agree with the Meertens Instituut (compare "Duden. Lexikon der Vornamen", Mannheim, Germany 2013)
― Anonymous User 7/11/2021
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Rosa and Volker Kohlheim agree with the Meertens Instituut (compare "Duden. Lexikon der Vornamen", Mannheim, Germany 2013)