Diminutives: Sechok
| R. Yitzchak Gaon | Iraq | fl. 636-660 |
| Mar R. Huna haLevi ben Yitzchak | Iraq | fl. 786-788 |
| Mar R. Yitzchak ben Mar R. Chanina Gaon | Iraq | fl. 833-838 |
| Chisdai ben Yitzchak ibn Shaprut | Spain | c. 915-970 |
| R. Tzemach ben Yitzchak Gaon | Iraq | fl. 988-997 |
| R. Yitzchak Gaon | Iraq | fl. 1038 |
| R. Yitzchak Alfasi | North Africa and Spain | 1013-1103 |
| R. Yitzchak ibn Ghayyas, known by the Hebrew abbreviation Ritz Gias | Spain | 1038-1089 |
| back to 6th-11th c. | ||
| Sechok ben Esther Yisraeli | Blois and Limoges, France | fl. 994 |
| Yitzchak | France and Rome | fl. 1007 |
| Mar Yitzchak b[en] R[eb] Elyakim | Koln, Germany | d. 1096 |
| heChasid David b[en] R[eb] Yitzchak | Koln, Germany | 1096 |
| Rabbenu Yitzchak b[en] R[eb] Moshe 'Oker Harim' | Mainz, Germany | d. 1096 |
| Mar Yitzchak [...] b[en] R[eb] Asher | Mainz, Germany | 1096 |
| Yitzchak | Mainz, Germany | d. 1096 |
| Mar Yitzchak haTzadik b[en] R[eb] David haParnas | Mainz, Germany | d. 1096 |
| Mar Yitzchak b[en] R[eb] Shmuel | Mainz, Germany | 1096 |
| Mar Yitzchak b[en] R[eb] Moshe | Mainz, Germany | 1096 |
| R[eb] Baruch b[en] R[eb] Yitzchak | Mainz, Germany | 1096 |
| Maras Guta eshes Rabbana R[eb] Yitzchak b[en] R[eb] Moshe | Mainz, Germany | 1096 |
| Maras Rachel haBachurah bas R[eb] Yitzchak b[en] R[eb] Asher | Mainz, Germany | d. 1096 |
| Mar Shmuel b[en] R[eb] Yitzchak b[en] R[eb] Shmuel | Mainz, Germany | 1096 |
| R[eb] Yehudah b[en] Rabbana Yitzchak | Mainz, Germany | 1096 |
| R[eb] Yehudah b[en] R[eb] Yitzchak | Mainz, Germany | fl. 1096 |
| R[eb] Yitzchak haLevi | Neuss, Germany | 1096 |
| Yitzchak | Worms, Germany | 1096 |
| Yitzchak ben Daniel | Worms, Germany | 1096 |
| Reb Meshulam b[en] R[eb] Yitzchak | Worms, Germany | 1096 |
| R[eb] Simchah haKohen ben Morenu Yitzchak Kohen | Worms, Germany | 1096 |
| R[eb] Natronai b[en] R[eb] Yitzchak | Xanten, Germany | 1096 |
| R[eb] Yehudah b[en] R[eb] Yitzchak haTayar haGadol | Germany | fl. 1096 |
| R[eb] Yitzchak haLevi | 1096 | |
| Yoel b[en] Rabbi Yitzchak | Bonn, Germany | 12th c. |
| Yitzchak | Germany | 12th c. |
| R[eb] Yitzchak b[en] R[eb] Yoel haLevi | Koln, Germany | d. 1146 |
| R[eb] Shmuel b[en] R[eb] Yitzchak | Worms, Germany | d. 1146 |
| HaRav R[eb] Yitzchak ben Rabbenu Elyakim | Wurzburg, Germany | d. 1147 |
| R[eb] Shimon b[en] R[eb] Yitzchak | Wurzburg, Germany | d. 1147 |
| R[eb] Yitzchak b[en] R[eb] Elazar | Blois, France | 1171 |
| R[eb] Yitzchak b[en] R[eb] Yehudah | Blois, France | 1171 |
| Ephraim b[en] Yitzchak | Regensburg, Germany | d. 1175 |
| R[eb] Yitzchak heChazan b[en] R[eb] Gedalyah | Neuss, Germany | d. 1186 |
| R[eb] Yitzchak b[en] R[eb] Shimshon | Neuss, Germany | d. 1186 |
| haRav R[abbi] Yitzchak b[en] R[eb] Asher haLevi | Speyer, Germany | fl. 1196 |
| R[eb] Yitzchak | Erfurt, Germany | 1221 |
| R[eb] Yitzchak b[en] R[eb] Meir | Germany | 1235 |
| Rabbi Yitzchak b[en] R[eb] Eliezer | Pforzheim, Germany | d. 1267 |
| R[eb] Yitzchak Katlein = Tzshatlein | Troyes, France | 1288 |
| heCh[aver] Yitzchak Kohen | Troyes, France | 1288 |
| Yitzchak | Troyes, France | 1288 |
| back to Crusades | ||