Robi 1

Robi is also used in the German-speaking world, where the name is a diminutive of Robert and Robin.

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Sources:
• (general): https://www.linkedin.com/pub/dir/?first=Robi&last=&search=Zoeken
• https://www.facebook.com/search/people?q=robi
• obituary of Robi Thomas (1961-2024): https://www.franken-gedenkt.de/traueranzeige/robi-thomas (in German)
• obituary of Robert "Robi" Finkel (1968-2018): https://www.trauer-im-allgaeu.de/traueranzeige/robert-finkel (in German)
• obituary of Robert "Robi" Penz (1975-2024): https://traueranzeigen.tt.com/traueranzeige/2024-04-16-robert-penz-465033 (in German)
• obituary of Robert "Robi" Rhomberg (1935-2021): https://todesanzeigen.vn.at/todesanzeige/robi-rhomberg-11-03-2021 (in German)
• obituary of Robin "Robi" Mattischeck (1967-2014): https://www.aachen-gedenkt.de/traueranzeige/robinrobi-mattischeck-2014 (in German)

Also Slovenian.