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- Jacob Isaac ben Shalom
- Jacob Isaac Ha-Ḥozeh mi-Lublin
- Jacob Joseph ben Ẓevi Ha-Kohen Katz of Polonnoye
- Jacob Joseph of Ostrog
- Jacob Koppel ben Aaron Sasslower
- Jacob Koppel ben Moses of Mezhirech
- Jacob Nazir
- Jacob of Corbeil
- Jacob of Kefar Sakhnayya
- Jacob of Marvège
- Jacob of Orleans
- Jacob of Pont-Sainte-Maxence
- Jacob of Sarug (Serugh)
- Jacob of Vienna
- Jacob Samson of Shepetovka
- Jacob, Benno
- Jacob, Berthold
- Jacob, Blessing of
- Jacob, Heinrich Eduard
- Jacob, Jack Frederick Raphael