Поиск еврейских предков

Добрый вечер! Помогите, пожалуйста , советом куда обратиться за помощью в розыске метрических данных для подтверждения еврейских корней.
Мой дедушка Дубровский Семен Зиновьевич род. В г. Днепропетровске , Украина, год рождения не известен , был евреем, документальное подтверждение - свидетельстве о рождении, которое, к сожалению , утеряно. Был женат на бабушке - Зайцевой Галине Ивановне (предположительно тоже еврейке). В браке был рожден мой отец Дубровский Александр Семенович 1945 года рождения. Он по документам значится уже русским.

Ищем потомков Чигиринского рава Нахмана Гольдштейна ("Чиринер ров").

Goldstein, Reb Nachman [of Tcherin] (b.?-d.1894).

Раби Нахман Гольдштейн (Чигиринский рав).

Known affectionately and reverently as the Tcheriner Rav, Reb Nachman was the son of Reb Zvi Aryeh of Breslov. His father's father, Reb Aharon, was the Chief Rabbi in Breslov in Rebbe Nachman's time. In fact, the Rebbe said that he invoked his ancestral merits in order to bring Reb Aharon - whose clarity in rendering halakhic decisions was unparalleled - to Breslov. An erudite scholar even as a young boy, Reb Nachman, who grew up in Breslov, shied away from Reb Noson in his early years. Reb Noson once called him over and said, "You know, it's very possible that Rebbe Nachman used his ancestral merits to bring your grandfather to Breslov only because of YOU."
After Reb Noson passed away, the Tcheriner Rav regretted having distanced himself from Reb Noson and he became very involved with Reb Noson's works. He published the Likutey Etzot HaMeshulash, the expanded Likutey Etzot (Advice) and collected Reb Noson's teachings in the Likutey Halakhot on all the same topics which appear in the earlier work. He also was the first to begin writing a commentary specifically on Rebbe Nachman's works, thereby making these complex tomes somewhat more accessible to the layman. His personal level of scholarship defies description.
Known as a matmid (diligent in Torah study), he often remained awake all night while immersed in study. As Rabbi of Tcherin, he was always being invited to weddings by the local residents, though he did not always go. Once, his attendant decided not to pass on the invitation since he knew that the Rav in any case, was not going to attend. When he discovered this, Reb Nachman was upset. "Whenever I receive an invitation to a wedding, I know that I'm not going to get any sleep that night (he would always only sleep till midnight and then rise to study Torah until morning). So, even if I don't go to the wedding, I stay up throughout the night studying. By not giving me the invitation, you 'cheated' me out of a full night of Torah!"
After writing his commentary Yekara DeShabbata, explaining the holiness of Shabbat as perceived in each lesson of the Likutey Moharan, the Tcheriner Rav said that he could no longer sleep on Shabbat. He said, "Someone who keeps Shabbat is known as a shomer Shabbat (shomer means watchman or guard). Everyone knows that it is forbidden for a watchman to sleep on the job! How then can I sleep on Shabbat?!"
A younger contemporary of Reb Nachman Chazan, the Tcheriner Rav was highly respected and honored by the Breslover Chassidim. He, together with Reb Avraham Ber, Rebbe Nachman's grandson, was responsible for Reb Avraham Sternhartz being appointed prayer leader for the Rosh HaShannah prayers. Still, when making the pilgrimage to Uman for Rosh HaShannah, he would not expect or allow any preferential treatment because of stature. "In Uman, we are all alike," he said. "When I set out for the Rosh HaShannah kibutz, I leave behind my rabbinical status and authority."
All told, he authored about twenty books, several of which were only seen by Breslover Chassidim in manuscript form before they were lost. Of his major works that remain with us are the Parparaot LeChokhmah on Likutey Moharan, Rimzey Maasiot on Rabbi Nachrnan's Stories and the source references for the Sefer HaMiddot. He also compiled a two-volume collection of teachings on various topics from the Baal Shem Tov and his major disciples, entitled Leshon Chassidim and Derekh Chassidim.

на фото: г. Чигирин (Украина). Место погребения рава Нахмана Гольдштейна.

Доброе время суток!
Константинов Николай Константинович, кантонист, из евреев.
Родился (высчитала по имеющимся документам) в 1837 году в Волынской губернии гор. Старо-Константинов (по данным переписи 1897г.), обучался в Тобольской школе кантонистов. С 1886 года купец. Умер 17 августа 1913г., захоронение сохранилось. Хотела бы поискать информацию о его семье: мать, отец, возможные братья и сестры.

BOllga написал:

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запись о его крещении

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Этим сейчас и занимаюсь, но пока безрезультатно.Видела записи в МК Тобольска записи датированные 1853, 1854 гг. о крещении кантонистов-евреев.

Geo Z написал:

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А откуда известно, что из евреев?

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Информация 100%.