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Who is the רנב"י quoted by the Shitta Mekubetzet to Nedaarim (8a s.v. אמר רב גידל)?
Could it be R. Nissim ben Yaakov Gaon?
In the Shitta Mekubetzet, רנב"י stands for R. Natan bar Yosef. He was a student of the Ramban, and wrote a commentary to an older work from the Ramban on the laws of vows.