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- Jacob ben Mordecai of Schwerin
- Jacob ben Moses of Bagnols
- Jacob ben Naphtali
- Jacob ben Nethanel ben Fayy?m?
- Jacob ben Nissim ibn Shahin
- Jacob ben Reuben
- Jacob ben Samson
- Jacob ben Simeon
- Jacob ben Sosas
- Jacob ben Yakar
- Jacob David ben Israel Issar
- Jacob Ha-Katan
- Jacob Ha-Kohen Bar Mordecai
- Jacob Isaac ben Shalom
- Jacob Isaac Ha-?ozeh mi-Lublin
- Jacob Joseph ben ?evi Ha-Kohen Katz of Polonnoye
- Jacob Joseph of Ostrog
- Jacob Koppel ben Aaron Sasslower
- Jacob Koppel ben Moses of Mezhirech
- Jacob Nazir